Guitar Hero is now the first game peripheral to be accepted into the Rock and Roll Hall of Fame in Cleveland, OH. The Guitar that was chosen is from the upcoming Guitar Hero: Warriors of Rock. I do find it strange that they choose this version of Guitar Hero to be entered into the Rock Museum since there is no data or reception of this game yet. Personally I would've gone with the original version of the guitar from Guitar Hero 1, kind of like the kick off to the entire genre, but that's just me with my craaaazy ideas. 

Its a marketing ploy.
also I've been to The Rock and Roll hall of fame a few times and they change the memorabilia in a few rooms every month.

"  Personally I would've gone with the original version of the guitar from Guitar Hero 1, kind of like the kick off to the entire genre "

Definitely marketing ploy. This game in particular is not iconic, the original was. This just shows that Activision is spending money on simple gimmicks rather than other, more important, matters