That’s just what the roadmap says 
11.1.5 is April 22nd (Update to the Guild Name Change Service), so we should see 11.1.7 sometime in June or July, so 11.2 would be August or September. 11.2 has to be out before Brewfest (September 20th) since there’s a Brewfest update in that patch. That would make the latest date for 11.2 September 16th.