First, the PTR is not live yet. And now there's a blue thread stating such over on the European forums. "Current PTR status: Not Live." Supremely helpful in the world of misinformation and confusion that propagates around the intertubes. Update: There is now a US blue thread as well.
The thread does note that "the status of the PTR may change fast and without warning." This basically means that it's in the final stage of getting ready to go live, and that means patch notes.
And on the issue of patch notes, we have heard from numerous blues over the weekend that they have them – but are just not releasing 'em yet. This is too bad, of course, but at least they're ready and will be handed out sooner rather than later.