http://ps3.ign.com/articles/116/1166810p1.html
Even though they said that the network may resume before then, the Store has a fixed release date: May 31st. And no store = no DLC.
Now, there is a tiny chance that it may come back before then, but you shouldn't hold your breath.
I'm actually a little ok (not completely) with it, cause I'll have L.A. Noire to entertain me till then, plus PC and Xbox users will explore the DLC thoroughly by then and find all the hidden, missable goodies for me.
