Well, thinking about Britney, if she decides to put B10 out soon, thats a possible option.
But I dont think we are going to get another single. Slumber Party hasnt hit the top 20 yet, and I doubt it will. If SP was a #1 I would say that a third single would have been the best option then, Glory would be more known by the GP thanks to that, what Make Me didn't do.
I'm here for a B10, if she wants to tour, the time is now and being realistic, looking back to the dark BJ times, I don't think there's a chance for a "Glorious Tour", there hasn't been any promo at all to make GP realise she is promoting her new album ( I don't if I'm expressing myself well, sorry).
What I try to say is that, it would be perfect to end her Piece of Me residency, and one mont after do a surprise release of her new album or something different, like uploading her first single and 5 hours later the album and the dates for her world tour. A visual album would be nice, but with different directors so we could get some new amazing photoshots and videos, just something different, I don't want her to follow any trends, but nowadays a visual can help every song from the album, which is positive if is well made, because if every song has a video, it will be more atractive to listen and watch