PvP rare set available again

The PvP rare set was removed from battlemaster vendor when season 3 rolled out. Now they are renamed and back. These five pieces are available at the quartermaster when you reach honored reputation in five TBC faction, Honor Hold/Thramall, Cenarion Expedition, Lower City, Sha'tar and Keepers of Time.

If Season 4 didn't come out together with Wrath of the Lich King, would season 2 arena gear be available like the PvP rare set?

Everyone would be honored or close to honored when they ding 70, so this is another fast gear-up, mostly for PvP players. Since the cost for the whole set costs around 20g, I guess every fresh level 70 would be running in them.

Tier tokens can be used to purchase PvP arena gear
It is getting clear that, patch 2.4 will be a PvP crosses with PvE and a give-loot patch.