When are they buffing Naut?

they already did

http://na.leagueoflegends.com/en/news/game-updates/patch/patch-715-notes#patch-champions Q early damage up, ult cooldown reduced at ranks 1 and 2.

These changes enhance Nautilus’s ability to lock down a priority target in fights and send an out-of-position carry into the deep. Q - Dredge Line BASE DAMAGE 60/105/150/195/240 ⇒ 80/120/160/200/240 R - Depth Charge COOLDOWN 140/110/80 seconds ⇒ 120/100/80 seconds

patch 7.15

Cause we need a tank being able to point and click cc and burst xD