The HTC One is everywhere right now and if HTC can get the supply chain sorted out they are onto a sure fire winner. One little piece of criticism it has received is the fact it ships with Android 4.1.2 when 4.2.2 had been out so long, it is also one of the areas that puts it behind the Samsung S4. Over the last couple of weeks there have been a few updates with a the last being a rather large one, but even then the core OS had remained 4.1.2. I have now been told that 4.2.2 is at the beta testing stage.
I have no idea yet how far along the ROM is in testing so estimating a time for release is pretty hard, but if everything is functioning well without any major setbacks we should see the latest version of Jelly Bean arriving soon. Sadly this info comes from a friend of a friend within HTC so we have no screen shots or even ROM details.