Games capable of saving directly to their own cartridges, the site learned, won't offer you the option to save to an external card. That means you'll never be given the choice -- games that can save internally will always do so. The site also discovered that you'll have to have a memory card in the Vita at startup in order to operate games that require external storage.
Sony told Kotaku Japan that in addition to save data, some games may use the memory card for DLC. Got it?