On November 11th at 3:00 am PT for NA, 4:00 UK time for EUW, and 2:00 CEST for EUNE, servers will go down for maintenance and the 5.22 patch will be applied.
"On 11/11/15, starting at, 01:30 Pacific time (09:30 UTC), ranked queues will be disabled in preparation for patch 5.22. At 03:00 Pacific time (11:00 UTC), the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 3 hours."Be sure to check your particular servers status page for your region's specific 5.22 maintenance times:
I'll keep you updated as more information on what the patch contains and patch notes become available. Feel free to check the [ 5.22 PBE content ] and the [2016 Preseason Spotlight] for a run down of what to expect in this MASSIVE preseason patch!