Well E3 is due very soon and of course rumours will fly around like crazy, also its a prime time to leak information, now most of us knew that NGP wouldn't be the "PSP 2's" final name, though it would be a million times better than the name mentioned in a thread labeled a rumour on gamespundit.com
Here is a quote from the source:
But today we received some new, and exclusive, information from an anonymous source.
The official name of the NGP!
Rumor has it that the new Sony handheld will bear the name PS Vita. Vita is Latin/Italian for ‘life’.
Does Sony hope to bring life back into their stock? Do they want to rejuvenate the PSP? Revitalize your needs for portable gaming?
Our source tells us that this will be the definite and final name of the new system Sony will bring out at the end of 2011.
Sony is expected to give further announcements on the E3 next week.