Honestly, I don't see Disney letting creative control of their franchises be outsourced to a competing company.
If Avalanche Software chose to become an independent contractor not linked to WB, then that might have been more likely for them to restart DI on their own, just lease the rights and put up all the funds for development themselves.
That way Disney gets a percentage of the sales income and none of the monetary drawbacks that lead to our favorite toys2life game being cancelled.
But I've seen a similar situation before, a company which had a game was directed to close it down, they restarted independently, but stated they had no intention of rebooting the game that made them famous/popular, much to the disappointment of the players of that game.
So, I'd have to say, this announcement isn't likely to give us any reason to expect the return of Disney Infinity.