I doubt we get a raid tier for 7.2, I don't think we'll see a new raid until 7.2.5. I can see 7.2 releasing around April/May which is 5-6 months after 7.1. Patch 7.1.5 isn't a full sized content patch so I imagine we get a new patch every 2-3 months which rotate from large content patches like 7.1 to smaller "bite-sized" content like 7.1.5.