The Vita supports patches, and MK specifically planned for it by leaving space on the game card to store the patches and DLC.

Also MK Vita supports the MK Hotfix system that can push down balance/gameplay changes without a patch. I'm certain hotfixes will be used to alter the gameplay where needed.

Does that mean we'll get patches and DLC? No but it leaves the door open for it.

That's good to read, even if they decide not to act on it. I for one, would buy whatever DLC they bring to the Vita version... just like I got every bit of DLC for the PS3 version :)