I have found a comment under a video of Raxxanterax, he said it's gonne be on at 5pm PST. that is 9 hours behind our European time... so Friday 02:00 in the morning for us.
I play at US servers and I think this might be legit so...another day of waiting for us
btw, PTR is always an US server. Only on the liver servers, you can choose what region u want to play. So I think at 5 pm it will go live for all regions. Because all regions play on the US servers via the PTR!
This next PTR cycle is super exciting, but it's worth considering that it has been rather common for the PTR to be delayed for one reason or another; therefore, while I believe the PTR will be up today, I wouldn't expect to see it until after 3pm PST or later.