It seems the June deadline was too much pressure as the release date for Disney Infinity has just been pushed back from June to August 18th in the US, August 23rd in the UK and August 20th elsewhere. The delay is said to be for polishing reasons and pressure from retailers rather than problems with the development of the game:
“We could deliver in June if we wanted to,” he said, adding, “Will a two-month timing change help us? Sure, of course. It gives us a little more time to add bells and whistles and make sure it really sings and pops.”
It does mean less time to play it over the summer, misses out on the synchronised launch with Monsters University and moves it nearer to the release of the rival franchise's sequel Skylanders: Swap Force which is due out around October.
Source: The New York Times