The GTX690 (dual GK104), and possibly the GTX670 (slightly limited GK104) will most likely be announced on the 28th on some NVIDIA Gaming show.
I would hope they also sneak in announcements for the GK107 cards, but somehow i doubt it.
The OEM variant is rated for 75W, thats low enough for no external Power, and even low enough for efficient passive cooling. Want, now.
I even considered getting a passive 7750, because its just great performance at a great price for a passive model, hope someone builds a NVIDIA variant to compete with that, otherwise i might switch.