When Is Ivy Bridge CPU Due Out???

So the latest article says that Ivy Bridge notebook CPU's are due out at the end of April. Do we know when IB desktop CPU's will come out? Is it still in June? I'm about to upgrade and currently I'm waiting on Kepler. Specifically the GTX 670 or if I can't afford it, the GTX 660Ti. Whenever Kepler comes out, I'm gonna upgrade. If IB is due out in June, that probably means the end of June right.... Do you guys think IB is really worth waiting for? If IB isn't out by the time Kepler debuts, do you think the i7 3770k is that much better than the current i7 2700k??