The game is releasing next week and I can’t wait to get my hands on it :).  Here’s some info from Famitsu:

• Title (tentative): Hatsune Miku Project DIVA 2nd
• Release Date: July 29th, 2010
• Price: 6090 JPY
• Platform: Playstation Portable
• Music: Two new songs so far confirmed. magnet by minato; and Romeo And Cinderella by doriko.
• Modules (see below): Piapro costume list.
• Controls: Directional pad now in use; bringing the total to 8-buttons. In addition, a “holding-button” function as seen in Project Arcade is also in use — making the game even more challenging. (source)
• Data: Transferring data from the first Project DIVA PSP game also evident. (source)
• Features: “Duets songs” will be introduced — two vocaloids on the screen together.
• Edit Mode: You’ll be able to see your edits in real time — convenient for matching Miku’s motions and button presses to the music.
• Other: Music from the first game to return.

Hmm.. so this time around, instead of having just the 4 buttons on the right, you get the have the direction buttons as part of the game too.  Interesting and challenging :).  I do hope there’s more songs in this one than the first game.

The full song list is available here.

You can pre-order the game here.

Some gratuitous screenshots: