From the blog announcing the release of Mint 13 RC:
"Ken Scharf Says:
May 16th, 2012 at 5:19 pm
Great news! I’m waiting for the KDE version, guess the first RC for that will come out after the final version on the Mate/Cinnamon edition does. If 13 KDE is as good as 12 was all will be right with the world!
Edit by Clem: I won’t give any ETA, but we’re planning KDE and Xfce editions next and I’d like them to be released at the same time."
So are we again going to have a Xubuntu-based Mint edition? I hope so. LMDE (Xfce) is a bit more fiddly for me than I want for a day-to-day desktop, so I'm using Xubuntu which is a great distro, especially so considering the small teams at Xfce and Xubuntu. But I'd love to return to Mint Xfce and I hope merlwiz79 will again be involved in its maintenance.