Mobile GPUs with CC >= 3.5 ??

does anyone know when M series will support CC >= 3.5 ?

Presumably not for a while. The only CC 3.5 cards now are Tesla K20 series and GTX Titan, both desktop cards.

would be great if they appear this year at least

The place to look will probably be future Mobile Quadro GPUs, though none of the recently announced chips are CC 3.5.