Thanks for the info, Bryan (and welcome to the boards!).
The kinds of complaints I usually read about Monks are:
a) Ki Strike is under-powered (as mentioned already).
b) For martial artists, their damage output leaves much to be desired. I doubt WotC will be upping their combat ability, but one can dream.
c) They're not customizable. Fighters, Wizards, Rogues, and Clerics may be built in very different ways, but one Monk is just about as good as another. The motto of the revisions is to make 3E more like 3E; well, 3E is all about options, so I'm betting they add a few more options to Monks (like in OA and Quintessential Monk).
d) They may (or may not) alter the multiclassing restrictions (which are dropped completely in OA).