The July 25th, 2005 meeting revealed some of Sony's early plans for the PlayStation 3. The January 27th, 2011 event labelled "PlayStation Meeting" is believed to lead to the long awaited unveiling of the PSP2.
Andriasang's picked up on the name via a series of Tweets from analyst Yasuaki Fujima. Apparently Fujima anticipates unexpected major announcements at the event, mostly due to financial timing. We imagine he's referencing the on-coming 3DS launch here too.
Why? Because it's pretty obvious we're about a week away from the unveiling of the PSP2.