The review is in Swedish. They have not yet done a full review but posted a preview with pictures and a few 3DMark graphs.
http://www.sweclockers.com/nyhet/16702-radeon-hd-7790-bonaire-i-sweclockers-testlabb
Google Translate:
AMD is first, and has already started sending out test samples to manufacturers and the media. Radeon HD 7790 is based on the graphics processor "Bonaire", which first and foremost is for laptops, but now are used in separate graphics card.
The new Mid-Maker has 768 stream processors, 128-bit memory bus and 1 or 2 GB of memory. In Sapphire's performance Dual-X OC, it is about a GPU in the 1075 MHz and 6.4 GHz GDDR5 memory. Performance-wise ports model thus somewhere between the Radeon HD 7770 GHz Edition and Radeon HD 7850th
The actual circuit board measures 21.5 inches and is equipped with a 6-pin PCI Express connector, which provides a maximum power of 150 W. In other visible connections for two DVI, one HDMI, and DisplayPort, and support for all common features, including AMD HD3D and Eyefinity.
Radeon HD 7790 is expected to show up sometime in the next few weeks, probably by the end of March or beginning of april. This model is for price point around 1200 Euros including VAT.