i got a galaxy nexus cheap off eBay and got Bluetooth low energy working on it with a bit of dev mod help as Google disabled it for some reason. With a couple of topeak sensors and ipbike it's working well.

the s3 and note 2 are very likely to get the 4.3 support because of Samsungs smart watch. The s4 and future flagships are in fact getting ant+ http://forum.xda-developers.com/show....php?t=2469353