Running the beta now. I have had a few strange things happen, but I can't seem to reproduce them
I created an account and locked the phone from it. I then fiddled around with the phone a bit and tried turning down the media volume. I then noticed that the PIN code field did not work (I couldn't activate it to enter a code). I also seem to have problems entering the code at app launch sometimes. It keeps overwriting the same number, so no matter how many numbers I enter, only the last one is left. I don't know how to reproduce this either though.
MY phone is a brand spanking new HTC One S (ICS/Sense 4)) btw. (It is rooted.)