The next slice of bullet hell from the developer is Akai Katana ("Akai" meaning "red," and "katana" meaning ... "katana"). The teaser trailer doesn't do much to teach us about the game, instead showing anime characters looking pained. It's safe to assume that some of those characters will be able to fly and fire upgradeable weapons while dodging screen-filling bullet patterns. Cave will hold location tests for the arcade game in Akihabara next week, so there will be more information (and probably off-screen footage) then.
The company also announced (PDF) an iPhone port of DoDonPachi Daifukkatsu for this summer. You can see an intense trailer for that after the break, as well.