My suspicions on why 2.4 will be the last patch before expansion pack:
  • Patch 2.5 has never been announced or mentioned, but 2.4 and 3.0 has. We knew about 2.1-2.4 since Fall '13
  • Syrcus Tower has almost all of the remaining bosses in Crystal Tower.
  • Expansion pack details will be revealed this fall (either Fan fest or TGS)
  • 2.3 and 2.4 are already prepping us for new races, locations and classes.