Cowon's iAudio 5 and iAudio G3
Neither is quite as exciting as the iAudio M5, but we should also mention that Cowon also has a couple of other new MP3 players on the way, the iAudio 5 and the iAudio G3.
Both are flash-based players and will probably come in the usual array of storage capacities (i.e. from 128MB up to 512MB or 1GB or something like that), and are supposed to be similar to the iAudio U2, with the iAudio 5 running off of a single AAA battery and the iAudio G3 running off a AA battery and getting up to 50 hours of playing time. Both should be out by November.