This wasn't exactly unexpected (Blizzard has, after all, already put Season 1 gear up for purchase), but Drysc has confirmed that Season 2 Arena gear-- that's the Merciless Gladiator gear-- will be available for purchase with regular honor as of Season 4.
As usual, Drysc provides a disclaimer that Blizzard may change those plans. And of course we have no idea yet when Season 4 will drop, although the usual Arena Season timing tells us that it will likely be sometime in March of this year (possibly with the release of patch 2.4, although as usual, we have no idea if the patch will come sooner or later).
But if you spent all your honor on Season 1 gear when Season 3 started, time to start saving again. Merciless Gladiator is going on sale.