I'm in for 1, going to be a nice upgrade from my aging T2i and it's really shaping up to be the camera I've wanted since DSLR's started shooting video.
Love:
-all the bitrate options, high(100-200mbps mov) when I need it for post, lower(AVCHD) for long form event stuff.
-1080p @96fps slow mo & 1080p60 standard recording(I shoot some hockey & like at least 1/2 speed slow mo as an option in my 29.97 projects)
-4k will be nice but mostly for downscaling(supposedly you can downscale 4k 8bit 420 to 2K 10bit 444 and retain all color info) and also 4k reframing in HD projects.
-10bit 422 out of HDMI @ 1080 which I can use with the AJA kipros I have access to at work
-rugged body (compared to my plastic t2i)
-Usable EVF
Could be better:
-8-bit 4:2:0 recording in cam, would have been nice to see at least 8-bit 422, but with the high bitrate options and the apparent 4k->2k 444 10 bit downscaling I should still be much better off than with my canon.
-the YAGH XLR/SDI accessory is likely to cost more than the camera. Seeing as it is doing 4k 422 uncompressed over SDI I can see why it costs so much but it would have been nice to see a second cheaper unit with just 2x XLR, a single 1080 HDSDI and battery powered instead of needing mains power (99% sure I won't get this and if I get something for audio it will probably be a juicedlink)
-release date: I've already preordered but can't wait
Sensor size isn't a huge issue for me, I wasn't heavily invested in glass for my canon so I won't be doing any adapting, just new lenses starting with the 2.8 12-35mm. I personally don't care for the overuse of extreme shallow depth of field(though agree it can have its place) so I was never looking at moving to full frame, there should still be a lot possible with micro 4/3 for video and it's still a larger sensor than the BM Pocket Cinema Camera.