New dungeons every patch or every 2 patch with increased difficulty (Wotlk model)
Normal dungeons (roughly the same difficulty as current heroics) / Heroic Dungeons (BC model, more in line with mechanaar hc than with arcatraz hc)
Basically there is no 5 man content in MoP outside of challenge mode for which there is little reason to do it more than once.
Puggable flex raid content (similar to Kara/ZA/ICC 10/EDC 10/SoO Flex). A decent in game tool to build raids cross-realm.
Note that i'm not for the removal of LFR (or against it for what it's worth) i just find sad that end game experience is limited to this for a lot of players.