To further expand on this, there is only one tier set per class regardless of spec. The secondary stats will be the same (also: they're not randomized) no matter what spec you are in when you use it, and the intellect/agility/strength will switch with your spec just like all the other gear. As for set bonuses, those also change with your spec. The wording on the token now says "appropriate for your class" rather than the previous "appropriate for your specialization". So there shouldn't be need to worry about switching specs before looting/activating the token.
OT: I agree that it would be nice to see wf/socket/tertiary on the token before use; after all, every other piece of loot that drops has those bonuses while the loot is still on the corpse, not randomly added once it enters a players inventory. I feel like I remember a while back, few months maybe, seeing either a blue post or maybe it was from a Q&A saying they were aware of the concern and discussing adding that information to the token, but as I haven't seen any word on that since then I wouldn't count on it for now.