I have to apologize for this being late. You guys asked for XBLA Wednesday posts to remain a staple of your Mondays and we intend to keep it that way. However, until this morning it seemed apparent that nothing was coming to the downloadable market, despite vigilant Googling.
With that said, there is one new title. It's a bit under the radar but it may appease the "Why is every arcade game 1200 MSP?" crowd.
Xotic - 800 MSP
Think you know shooters? Think again. XOTIC is a completely new hybrid; rack up massive point chains, play on 23 levels, and compete globally. Create transparent aerial landing platforms while going for some arcade-style point pick-ups. Use power-ups to boost your abilities. And fire up eight upgradeable weapons to combat the minions of the Orb. All while roaming beautiful but mysterious environments. You’ll see stuff you’ve never seen before, because there’s never been a game like this before.
We've got the full list of Xotic achievements - check the list for guides to unlocking them.