The rev. F routers have started to appear. They're nothing to get excited about. The wireless-N is not 802.11n-2009 compliant.
Nor do they have gigabit ports.
The rev. G routers which are 802.11n-2009 compliant and have gigabit ports are not in circulation yet.
I got a Rev F with my install about 6 weeks ago. Had online gaming issues which pointed to the new router. Replaced router (got an E rev) and problems disappeared. Connected my DIR-655 to it for "N" wireless.