Which Android (with Jelly Bean, 4.2) devices support Bluetooth low energy (BLE)? Does Samsung Galaxy S III support it?
(This question came up after reading the blog post Bluetooth 4.0 on Galaxy S3.)
I believe that currently only the Motorola RAZR has BLE support (because Motorola provides their own BLE library to developers). The S3 does not support BLE (drivers / API not available).
This letter from the COOKOO watch project describes Android's Bluetooth 4.0 disaster well.
Additionally, this issue has become the unofficial venting / complaining forum for developers. There are occasionally some useful updates there.
Edit
Bluetooth low energy is now officially supported in Android 4.3 (API 18). Check the developer's guide here.