Verified answer

Chances are there won't be a trial out as soon as it releases, but they will probably have buddy keys (similar to a trial but you need to ask someone for the key, and they need to have bought the game) with each purchase so that would probably be your best bet if you can't wait a month or two down the road for when they finally do have trials.

Not anytime soon.

Maybe 6 months or so but if the game is still doing well more like a year. Look at how long it took Wow to offer a trial version.