Disclaimer : While the first two devices are almost certainly coming (unless Nvidia pulls out a Shield Tablet X1-type move), the third one is just extrapolation based on previous news dating back to April 24th, and experience as to Nvidia’s method of announcing new Shield products.
Let’s start from the beginning, shall we. On June 15th, XDA-Developpers reported that they had found a device codenamed “mdarcy” in "the Google Play Developer Consoles’ Device Catalogue". The product was supposed to boast the revised, shrunk-down version of the Tegra X1 found in the new Nintendo Switch and Nintendo Switch Lite, the t210b01. What supports this is the fact that “mariko” is the codename for the t210b01 chip, and “darcy” is the device name for the 2017 Shield TV, and “mdarcy” is obviously a “darcy” device based on “mariko”. The device will likely have a smaller footprint conpared to the 2017 current-gen Shield TV, and could go fanless (I personally don’t back up this claim, as even the Nintendo Switch Lite, which consumes certainly less power than a fixed set-top-box, needs a fan and heatsink in order not to overheat, so imagine a device that would stay in your living room 100% of the time and that would have higher clock speeds in order to output 4K at 60fps… Yeaaah, it’s gonna be a no for me).
But while we knew Nvidia was planning mdarcy, on August 5th, some new leaks coming directly from the related FCC filing by Nvidia have taught us that they’re planning a second Shield TV device codenamed “sif”. And unlike mdarcy, sif is supposedly the next-gen Shield TV. It is currently unclear which chip Nvidia chose for sif, but I would expect the Tegra X2 or the low-power version of the Tegra Xavier, since it will need to be more powerful than mdarcy (also, don’t trust the website when it says mdarcy and sif will share SoCs as their claim isn’t backed up by any source whatsoever and it simply doesn't make any sense). IO-wise, sif will apparently present no USB port (which I find quite strange and disappointing but oh well…) nor will it support/feature a TV tuner.
Fast forward to the 30th of September, and mysmartprice.com reported that sif was just certified for Bluetooth 5.0 by the Bluetooth SIG, confirming what we know from the FCC filings and the Shield Experience 8,0 update. And we know the device concerned is not mdarcy because of the model number, that is to say P3430. The Bluetooth certification usually happening near the release date of new products, we can definitely expect the new Shield TVs some time soon, possibly before the end of the year (I really can’t imagine Nvidia unveiling these alongside the 1660ti Super, 1650ti and 1660 Super), or Q1 2020 (although I have no clue as to why they would do that). Both Shield TVs will also likely come out with new accessories, two of which were leaked in March: a controller, “stormcaster”, and a remote, “friday”.
But that’s only two devices, right? And I promised you three. So, the Shield 2-in-1 convertible tablet, codename “mystique”. I know, there haven’t been any more leaks pointing to a release being due for the same time frame as the two above (the only clue we got of the existence of such a product was on the 24th of April), however the thing is Nvidia has always released their Shield products all at the same time, and around that time of the year. Plus, it’s been 4 years since we last got a mobile device from Nvidia (NO, the Nintendo Switch DOESN’T COUNT), and more importantly, between April and present time, a game-changing event (for this device, at least ) occurred: Android 10 has dropped, and it features a desktop mode. You can see where this is going, right? I predict that if the tablet ever comes to exist, it will use it as following: when handheld (only the tablet, not the keyboard), it will run Android normally. But as soon as you’ll snap on the keyboard, it will switch to the desktop mode WHILE still outputting to the primary display, "Desktop" which is one of the three leaked modes Nvidia has worked on (more precisely, the “NVIDIA Desktop Experience”). From the April leak, you can also choose to activate a specific mode on start up. And with the new Surface line up just announced, I wonder if they’re not thinking about taking on Microsoft’s solution head to head before it is too late, as Microsoft plans to combine Android and Windws in one device. I REALLY hope mystique will come out before the end of the year alongside mdarcy and sif, so we can finally have a decently-priced top-spec Android tablet again (2015 vibes anyone?). Another thing I hope for is support for stormcaster with mystique, like the the precedent Shield Tablets have supported the STBs' controllers.
NEW STUFF : Hey, itsa me, your boy, about 3 days late, to tell you "sif" got certified by the WiFi alliance for... WiFi 5 (802.11 ac if you prefer). So yeah, no WiFi 6, which isn't all that great (although users tend to prefer to connect SHIELD TVs via Ethernet). If it helps bringing the price down, like the absence of NFC on the Shield Tablet K1, then why not. No need for me to tell you the launch is nearing rapidly. My guess is Nvidia is targeting a release after the announcement at CES 2020, as other SHIELD TVs were announced there at that time of the year.
By the way, we have a problem of conflicting sources here, as although I said sif was the device that was just certified, 9to5Google claims the model number P3430 (the model that got certified) refers to mdarcy, while literally every single other source has said P3430 was in fact sif. And by reading their article, it seems as though they don't know about sif's (or simply the other SHIELD TV in the works) existence.
New sources : https://www.wi-fi.org/product-finder-results?keywords=P3430
(Take this one with a pinch of salt, like the mysmartprice link)