So it seems that Atari are going to insist that side-scrolling action platformers are a thing that can happen, by announcing Blade Kitten. Atari say: "Players will jump right in and easily begin exploring and fighting their way through 19 levels, including three exploration levels with Noot (a rideable alien mount). Blade Kitten also features straight forward gameplay mechanics, intuitive “scramble style” exploration, fully voiced dialogue, dramatic narrative and powerful visual direction." Powerfully pink, anyway. The game is out in September. Trailer below.
(And I'm wishing there was some way we could track exactly how many RPS readers pick this up when it is released.)