There are still not too many details to go on (at least beyond the information released a little over a month ago). The LSI SF3739 is the enthusiast-class third generation Sandforce SSD controller and is the one expected to appear in high-end desktops or workstations. They support either SATA 6Gbps or 4 lanes of PCIe 2.0 and thus can appear in either drive form factor. It is designed to support either SLC, MLC, or even TLC memory cells. Up to 2TB of storage will be possible.
Image Credit: VR-Zone
VR-Zone was unable to test the device due to a lack of firmware but, hey, if you have a camera why not take it apart? They have a few pictures of the SF3739 board in each of the two possible interfaces. I will leave the other images as an exercise to the reader to seek.
The third generation of Sandforce controllers was expected to launch in Q1 but that might be bumped to as late as Q3 according to one or more of their partners.