After giving 4.2 Monk a month to settle here are my thoughts.

60s Perfect Balance and 90s Mantra Literally the only complaint I have is that it shouldn't have taken till now to occur. Great in dungeons and great in raid.

Wind Tackle Greased Lightning stack It's mostly an improvement to dungeon functionality. Monk now has 4 GCDs before it starts dealing full AOE damage instead of 7. Otherwise it misses the point entirely about the issue with Tackle Mastery, Fists of Fire is still the supreme stance and the other two may as well not exist.

Brotherhood Affects Monk A minor improvement but it also ignores the problem with the skills design. By not proccing off casters Monk is still hamstrung in comps with more than one caster. We also still lack the overhead other jobs have for gauge skills between getting procs and being capped. If nothing else Brotherhoods where you fail to get a full Forbidden Chakra are much less common now and our burst is decidedly the best in the game.