As others have said, they don't use the Q&A to announce specific new content. They did say that they were working on a new game mode that would provide more to do for all players than a new raid would (which would presumably be tougher than HSTR, and therefore eliminate new players and lesser guilds from the possibility of completing it).
While they're not saying what this new thing is that would be accessible to everyone, they have also said in someplace or other (can't remember where) that the new thing they're working on would allow you to use your entire roster.
What does that mean? We don't know, but since they don't announce specifics in Q&A, the next hint will likely come in a Road Ahead post, and then when the game mode is more-or-less ready, they'll make a separate, specific announcement for that.
There is of course much speculation - an advanced Galactic War, vehicle combat, and more have been mentioned - but you'll have to wait for 1st of the month type announcements to get more details. We can hope we'll get the next hint in just a couple days, but I'm thinking they won't do it that soon. They'll have some May4th temporary events (double drops and whatever) and they probably won't want to clutter the schedule too much.
So I expect the next bit of info to drop June 1, with a more specific announcement of the "Get ready, this is coming," type coming somewhere later in June or during July.
That's just a guess, of course, no one knows what's happening until CG announces it, but I don't think you'll get better guesses from anyone else.