In this Patch 10.1 PTR build, the new combined Hall of Fame achievement reveals that the Hall of Fame has 200 spots for guilds in the Aberrus raid.
With cross-faction guilds coming, Blizzard announced the Aberrus Hall of Fame would be combined into one big Hall of Fame, however they never announced how many guilds will be able to enter and players speculated if it would be 100 or 200.
The Hall of Fame achievement has now revealed that the number is 200!