One of the guys I ride with regularly has D2I. It seems to work well. I wouldn't get it because it's expensive and heavy but if it was expensive and significantly lighter than cables I'd consider it.

I dont' think the KCNC system uses 135mm axles but I don't know that for sure. The big advantage of 135 is less wheel dish, but taking that and then using the extra 5mm for cogs and keeping the same dish would negate that advantage. And would prevent its been retrofitted to existing bikes, seriously limiting its market.

Tiso shows a prototype electronic 12sp:
http://www.bikerumor.com/2011/09/29/...sette-pulleys/

Some of the current Tiso stuff looks pretty: http://www.tisobike.com/