Valve hasn't announced how Community QuickPlay servers will be affected, but the
Meet Your Match update is changing how QuickPlay works.
It looks like a lobby system is being introduced into QuickPlay. John Schoenick's previous posts imply that servers will now need a GSLT to be in the QuickPlay pool... it will also like require tf_mm_servermode 1 since that is used to put servers into QuickPlay lobby pools.
It may also mean that the 3 tf_server_identity cvars are going away.
This post will be updated with more information once Valve makes any official announcements about it.
Update 2016-07-11:
Valve isn't allowing community servers into the Casual game mode at the present time and there are no indications that they ever will. This basically means that QuickPlay as we knew it is dead.
On the bright side, the "Community Servers" (aka server browser) button now lives on the same menu as the Competitive, Casual, and MvM buttons.