It appears so in the forum. 
I run 6.2.2 fo’ life!
Pretty sure hackers want to play the stress test as well!
I’m gonna guess its just the shear overload of all those classic players Blizzard said didn’t exist hanging out on the forums, waiting for the stress test to start. Just a guess though.
The BFA hamsters are DOSing the classic forums!
The forums do seem kind of sluggish.
If this is any indication of classic launch demand:
We’re gonna need a bigger boat.
mine is getting another update at 1.6 MB/s 
I wonder when the servers will show available…
Still a nope for me as well.
Servers are offline for me…
It’s up now, but connecting to server takes 5 years from the sheer load
Logging in to game server…
only the BEST releases get a DDOS attaques, its like computers spamming hearts so i think its a GOOD sign B]]
Yep that is where I’m at.
This is what happens when you require a sub for your stress test and don’t open it up to everyone who is saving their sub for launch day…
Blizzard, R. Lee Ermey has something to say to you about this stress test. https://www.youtube.com/watch?v=-ZYlXEUo-Lo