Ready the Microsoft Points, Xbox 360 owner, for this week's Xbox Live Arcade update promises to be a big one, with first-person brawler Zeno Clash and top-down shoot 'em up Raystorm HD arriving this Wednesday.

ACE Team's quirky Zeno Clash gets its "Ultimate Edition" after a brief delay. The Xbox Live Arcade release brings with it new attacks, weapons, enemies and a new game mode, hopefully addressing some of the concerns we had with the PC version of the game, released last year. Zeno Clash: Ultimate Edition is yours for 1200 Microsoft Points.

Square Enix and Taito's high-definition update of PlayStation shooter Raystorm also checks in Wednesday, also for 1200 Microsoft Points. You can read our hands-on impressions of Raystorm HD from Tokyo Game Show 2009 right here.

Perhaps you noticed that today Zeno Clash: Ultimate Edition was supposed to release on Xbox Live Arcade. Perhaps you noticed that it did not. "It's been pushed back a tad," says the developer.

"Sorry about that to everyone," wrote Andres Bordeu on the ACE Team forums. "It should come out early April. Atlus will be releasing more info through one of the next press releases. Just a little more patience, it'll be out really soon. As soon as we have new info we'll post it somewhere here."

The open world fighting game's Ultimate Edition adds new attacks, weapons, enemies and a new game mode. There is no word yet on pricing, but based on the price tag of its PC version, it could be around 1200 Microsoft Points.

Zeno Clash on XBLA Release Date? [ACE Team Forums via Eurogamer]