But this won't be like the wait between 31.25 and 34.XX. Its just so awesome that this is something that is Coming Soon To A Fortress Near You!
Just be careful about counting your chickens before they hatch.
Remember that cities took about a couple months, then, all of a sudden, Toady detoured into making mummies and such, and wound up tacking another 9 months or so to the time it took to release 34.01 because of interactions being so difficult to code, and those were never part of his initial plans for that release.
None of the year-longish releases were initially planned to take that long. Toady just kept extending it as there were always unforeseen hiccups and things he suddenly decided he needed to add at the time.
He might release in a month, he might suddenly decide to add the whole sphere system into the way mineral veins are shaped for minecarts to explore, and all of a sudden we have a 8-month delay so that Toady can make "ocean sphere" hemitite different from "sky sphere" hemitite.
Or in other words, if you have a fortress going now, go ahead and play it as it lies, and just prepare for a pleasant surprise if he releases in a month or so. That way, if he doesn't release that soon, you'll at least have had fun with the fortress you have now. (It's not like there isn't plenty to enjoy about training animals for right now, right? Savor what you've got.)