Here's something interesting from a big manufacturer. The Korg Kaossilator (that link might have gone dead by the time you read this): It's a (presumably) cheap little box. 100 sounds, controlled by the x-y pad from a Kaoss Pad. Left-right controls pitch, according to one of 31 scales. Up-down controls anything else - cutoff frequency, modulation etc. Presumably it's playing arpeggios locked to MIDI clock. I bet it's fun, although it's rather unfortunate that the babelfish translation of the leaked German page describes it as: "a new cliche Synthesizer in the vest pocket format". No price or date yet. (Via Supermel74 and many other forums)
UPDATE: It's confirmed and real, UK price is £117.