The 22nd is later than the MCAT usually is, so it should be in later June, 22nd or 23rd at the latest. This could possibly mean you get your secondaries a day or two later than the 2006 bunch, but other than that it should have no effect on your life.
It also means the wise-guys who took the MCAT August after their sophomore year will get a full 3 week jump, OMG we're screwed!