Seems like people on NeoGAF found (or someone else found) evidence that the NGP will be called Vita by looking through the source of the Sony E3 site. It is now removed but was apparently there earlier.
QUOTE said:I spy with my little eye...
http://us.playstation.com/e3-2011/
'View Source'
'Ctrl-f: Vita'
Quote:
[*] PS Vita®
- Features
- Games & Media
These links, of course, don't go anywhere yet.