iPad 2 with FaceTime video calling is coming ahead of schedule according to Apple Insider who cite "a person with proven knowledge of Apple's future product plans". They say Q1 of next year, but perhaps as soon as before the holiday season.
Q1 2011 wouldn't really be ahead of schedule, however, as that's pretty much when we expect them. (iPad was announced at the beginning of Q1 2010 and shipped just after the end of Q1, not a huge difference). Before the holidays of this year, however, would be a change.