The long awaited Aion patch 1.9 is available for download on the PTS as I write this post. The server should be down for maintenance while the patch is being applied. The patch is 3199MB in size.
Update: At some point patch download stopped and got reset. The new size is 4028MB and the version is 1.9.0.1.
WHOA! That’s a huge patch! 😛