Maisie is appearing...
in an episode of Doctor Who
http://www.bbcamerica.com/doctor-who/extras/games-of-thrones-maisie-williams-to-guest-star-on-doctor-who/
I just read this on another site and came here to see if anyone had already posted about it.
Excellent news in my opinion. GOT and DW are two of my favourite, currently running shows.
I said this elsewhere before but for the last couple of years I've thought that Maisie would make a great companion once she's finished with GOT. A guest spot is a great start towards that, depending on the character she plays.