The PSP has already been graced by the visual novel Stein's Gate, to roaring sales (65,000 opening). Now the Vita gets a double dose with Steins Gate and a fan disc expansion available separately. What's Stein's Gate? There's a decent explanation of the anime here and the official Japanese site is here.
They'll ship next March with a limited edition bundle in the mix. That should give the Vita a neat little boost with developer 5pb at the reins, and with 999 doing well and getting great reviews over here, there's slightly more chance of us getting a western version this time. Here's a video from the PSP version.