Ever since the start of Arena Season 3 it seems that quite a few players have been experiencing issues with server queues due to the sudden influx of players both signing on to get their new loot and also vie for a shot at a higher arena rating now that they've all been reset to 1500. Drysc informs us of what they're doing:

We have raised some of the maximum population caps on a few realms that were hitting regular queues just from 2.3. If it's required we can do the same for more realms, or take some other action to help bring populations back in-line.

But will we be seeing any new realms anytime soon? Nope:

It's a possible solution if it really looks like there's enough there to make up a whole other realm. What we could possibly do is open a new realm, have free transfers from all Oceanic realms to it, and disable character creation. It would all depend on actual numbers and trends of players, which I don't have in front of me.

It would be a shame to jump the gun and assume that the 2.3 and season 3 buzz won't die down, cave in to short-lived complaints, and open a new realm/offer transfers for what will very likely be a short term problem.

So for now, just sit tight. Like usual, the reports are most likely greatly exaggerated. But if you're worried about 2v2 Arena queues, Drysc thinks you should try another bracket:

There's a limitation on how many games can run at the same time, and while we're always looking to expand and improve our infrastructure to 'give some extra slack' to those types of restrictions, there are no current plans to see an increased amount of games running.

We recommend playing in the larger team sizes, or outside of the peak play times. 2v2 teams are obviously the most abundant, and if you just go up one team size to 3v3 or play before or after the peak ~5PM-9PM, you should have an easier time.

If tournaments like Dreamhack mean anything, 3v3 is the bracket to work on, so get practicing!