Yeah, they missed Fall 2010 as a ship window, and I'd say Fall 2011 is looking a bit unlikely, too :-) Unfortunate, because I could really use it right now!
On the positive side, activity on the other iOS apps seems to have tapered off a bit, which you might expect if all of their iOS talent is feverishly working on a new app. Of course, said talent also might be busy working on Mac projects, or tomorrow they might trot out new versions of several of the iOS apps, or maybe a few of them took a vacation, so it is hard to draw any firm conclusions. It is a pretty safe bet to assume that Hofstadter's Law will apply:
It always takes longer than expected, even when you take Hofstdter's Law into consideration.