Complementing the limited edition chrome controller released previously (the one with the improved d-pad), Microsoft will be releasing two more of the model next month.
There'll be a red one and a blue one, to go with the existing silver model. All three will feature a chrome finish and the better d-pad, and all three will cost around USD$55.
Seems like they are always working to improve their D-pad. Which I don't think is bad but I don't really see if they are really improving them or not. The designs look decent though.
I think the blue one looks really nice I do agree with what has been said above though. I can not see a reason for them to want to improve the D-Pad all seems fine to me.