I dont' think it's going to be much different from those famous terms: BASIC, EXPERT, COMPANION, MASTER. Ah, the good old days..when levels were detailed up to 36th and you didn't have to deal with halflings past 8th..sigh..memories...

Wait, I forgot the IMMORTAL LEVEL RULES!:
http://www.acaeum.com/ddindexes/setpages/highdd.html
Along those same lines, I think those names mean very little. Players are still going to refer to levels..and most DM's are still going to quit at about 15the level..about the time even this edition will break back down into a series of number crunching nightmares... There will be the usual terminology then: Heroic, Number Crunching levels, and Number Crunching Nightmare Levels.

(humor emphasized)
jh