GF7800GS won't be coming out according to nV (it was an engineering sample for testing) which was leaked by Anand;http://www.nvnews.net/vbulletin/showthread.php?t=60757
Som people thinks this means it will come out for AGP, but that's a stretch.
GF7200 in Fabruary and GF7600 in March according to Anandhttp://www.anandtech.com/video/showdoc.aspx?i=2595
PS, I hate Anandtech.
And the GF7300 like Cleeve said;http://www.theinquirer.net/?article=28460
So I assume that's gonna be out around the same time frame as the two others above.