PTS is updated with the 64 bit client
It appears that the 64 bit client and assets are being pushed to the PTS. It is still in a rough state, but expect it to improve here soon(tm)
The patch is small, and it does not contain all the assets built for 64 bit. So expect crashes.
Addons are currently disabled.
This has not rolled out to everyone quite yet, and many players can’t go past the character select screen when using the 64 bit client on PTS. Update and enter at your own risk!
To use the 64-bit client, in Glyph go to Settings > General > and choose your CPU.