Downloaded and flashed the latest nightly (6/29) ALT key is still not working, dictionary when using the hard keys still doesn't work. The hard key light is working now and the native torch app is also working now. The ALT key is a killer, so is the no dictionary while keyboard typing
Alt Key works fine, both single press, and double (which acts like Alt Lock).
Alt Lock key doesn't work, but double-press on Alt key makes that mostly irrelevant.
If your Alt key isn't working something is off - works fine on mine, and I've not heard any other feedback about it not working.