SpaceX hasn't confirmed it, however I would assume that that would be the case. Elon has stated in the past that the legs would provide pitch stability which was missing in the last attempt to relight the first stage. Without it the first stage likely would tumble and a relight would be impossible due to the propellant being centrifuged.

Here's a link which talks about it (about halfway through the article): http://www.space.com/23009-spacex-falcon-9-rocket-launch-tes...