See also:
Obama aide: Ending 'don't ask, don't tell' must wait - CNN.com
Ending DADT will not happen right away, but it will happen through the normal legislative process. I always thought that Clinton tried to do it the "wrong way" (through executive order, if I remember correctly?) and it backfired, leading to the DADT compromise. Obama is going about this in a way that will accomplish results.
For me, the son of an USAF officer, grandson of an Army officer, brother of officers in three services, it's a bittersweet time. I'm way too old to sign up to follow my family tradition, but it's good to know the barriers are about to fall.