Sony Japan has confirmed that users won't get a decision in whether the PlayStation Vita saves games to internal memory, or a separate memory card.
In a statement to Kotaku Japan, Sony said that where the game saves will be down to the developer's discretion. This means that some games won't be playable without a separate memory card.
Games in this category are Uncharted: Golden Abyss, Disgaea 3 Return, Everybody's Golf 6 and the new Ridge Racer game being developed by Namco Bandai.
Source: Kotaku Japan