"officially released" in this sense means the information, not the product itself. Basically it is about keeping internal information internal, as in even if we have information about when X will happen, we are not supposed to reveal it unless told so (which is also what every team member has to sign as part of the DPA (which in turn refers to German Data Protection laws)).
As for release date of level caps - we (as the team) simply dont have it. We can not reveal information we do not have and if we had it - see above ;-). My guess is that information like this is at the Product Team and QA and its their decision if and when anything about it can go public. Specific planned dates can and will change though when problems arise, so giving an actual date that later had to be postponed will also just result in shitstorms
Maybe the CMs will post a bit more in advance about upcoming level caps (or get clearance for us to make a bigger summary post) but as of yet there is nothing official to say about the release date of the next level cap or the actual content (apart from it being level 90 since we've been following a 2-3-2-3 cycle for some years now with the exception of 57-58 and 62-67) of it.
A practical example from last patch:
"Hall of Earth: Sankeniya: Boss add “Incarnation of Nature” deals less damage now "
I (and some others who help QA) knew exactly how much less, or rather "less" it now was (from base damage scaling with defense that hit every non-tank for >100% to a ~52% percentage-based hit) and that it would only
lessen but certainly not
solve the problem ( the boss is beatable again now, but not in a way we consider sufficiently well ) and that had been sent back to RW again. That still doesn't mean I'm supposed to change patch notes on my own or to reveal the exact values of the change before the patch is live or in some cases before players have tried it out, as much as I'd like. The same applies to when we have information about upcoming content, we simply do not decide when internal information is to be made public, and until it is, we can't talk about it.