Lumines 2 Confirmed
It does in fact exist, and the proof is now available
You may recall a little while ago the leaking of a Ubisoft document provided by GamePro which cited the company's lineup for the fiscal year of 2007. Among the list of various titles, some known and some new, was a sequel to Tetsuya Mizuguchi's hit musical puzzler, Lumines. Ubisoft soon denied the list, forcing GamePro to pull it, and the rest is history.
So having brought that back up, check out this video. A minute or so into it, Steve Truitt reveals the first confirmation of Lumines 2 for the PSP.
The game has been confirmed to be on display at E3 in a couple weeks, so we'll let you know when we find out more.