Without doubt the last 18 months have seen a sea-change come across international downhill bike racing where the 26" wheel has been firmly ousted by the 27.5" (except Specialized who are doggedly sticking to 650b!)... and new bikes have been announced on a pretty regular basis as 2015 models.
At the recent Mont-Sainte Anne round of the UCI World Cup two new bikes were announced and racing in team colours, the 2015 Specialized Demo 650b and the 2015 Santa Cruz V10 27.5. However unlike Specialized, Santa Cruz are still keeping technical details under wrap, though they have released some great images and Josh 'Ratboy' Bryceland almost took out the event.
Source: Santa Cruz Bicycles