Obviously this leak should be taken with a grain of salt due to the discrepancies in the leak. For example the already past release date, and an extremely high price with regards to HD trilogy remasters both call for a second look into the leak. However Sony has recently released several HD Trilogies that first appeared on the PS3, such as The Sly Collection, Ratchet and Clank Collection, and The Jak Collection. Sony seems to love bringing over Playstation classics to the Vita and making a quick buck. So it definitely isn't out of the realm of possibility that we could see a Prince of Persia Trilogy on the PS Vita sometime soon.
The Prince of Persia trilogy originally landed on the PS3, much like the other trilogies before they made their way to the PS Vita. It included The Sands of Time, Warrior Within, and The Two Thrones. The Prince of Persia franchise is a long running and very successful franchise that even got turned into a full feature film on the silver screen. The series has become a big part of Sony, so it is almost certain that we will see the franchise appear on the Vita and the trilogy offers a perfect opportunity.