I got 3.2.17 update in the play store. It didn't include GEL. I had removed the launcher so I added it back. It's now GNL.
"OK Google" works when you have Google now open if you have stock launcher but that is it. You have to have Google now open. For it to work on any home screen, you need to install Google now launcher.
Edit: hot word detection is cool but at the expense of battery. Wow! Idle all night (over 9 hours) and 11% battery gone. Before enabling and adding GNL, is lose about 3% overnight (with everything syncing and location services on).
Edit 2: I disabled hot word detection and battery life is a lot better. The active listening needs to be optimized. It certainly doesn't work as efficiently as it would on the moto x.
I don't see much advantage of GNL over the stock launcher so far.
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