Disappointed Sigma aren't stepping up the game. Well, they probably are working on something, but these minor upgrades are pretty boring. The original DP1 (or whatever it was called) was interesting when it first came out, and the later models built upon this, but now with the mirrorless cameras and more advances compacts, I can't see many people buying these.
I hope there's more to the upgrade than we know right now. If they really speed up the AF they might give the Fuji x100 at least a little competition, esp. from those who decline to pay 1200 for a compact.
I have a thing for Sigma DPS2, its minimalist design, its Foveon sensor and its simplicity. But I also sort of agree with ricardovaste and Janis, I wish Sigma would lift the game and produce a DPS with faster AF and possibly faster lens, and possibly a slightly larger APS-C sensor if possible.