I expect the first special will be New Year's Day, and while it's annoying to have another Specials year, at least they can have a proper relaunch for the 60th.
Given that the eight episode Series 13 has now become a six episode series, it looks like they've just moved two episodes to next year to avoid having another year without anything.
As for who will be 14 - first we have to see who the new showrunner is, and look at who's been in stuff they've done before.
My only wishes for the new showrunner are (a) that they're not a fanboy (or girl) so we get some fresh ideas and (b) they can manage to make a series a year, every year.