According to Kevin Rose the new iPad is likely to be announced in the next several weeks:
From: Kevin Rose (Foundation Newsletter)UPDATE: Spoke w/another source, the display has a "higher dpi", but not technically a retina display. This seems odd to me, we'll have to wait and see..
I have it on good authority that Apple will be announcing the iPad 2 in the next "3-4 weeks", possibly Tuesday February 1st. The iPad 2 will feature a retina display and front/back cameras.
If you're thinking of buying an iPad, hold off for now.
Kevin