It was 6 weeks from announcement of PTS character xfer until the release of 1.2. This was with 1.2 being VERY rough AND RWZs being removed. So basically 6 weeks to test 5 Ops bosses. And they were still broken on release... and have been almost 1/2 the time since the release of 1.2.
Six weeks from now is the end of September, which is in the "TFB will be released next month" time frame as well as putting it on par with the release of MoP.
Bioware might be bad at quite a few things, but they're not stupid. They know they need something to compete with MoP.
Release of PTS - Competes with GW2 launch.
Release on live - Competes with MoP going live.