14.1 final already available :
http://kodi.tv/download/
But strange bug with smart playlists and movie set.
When entering smart playlist from Videos > Playlists and select a movie set and "enter" the movie set to display movies and press back space to return to main movie list, every thing is OK.
When browsing entire library from Movies menu, you can enter a movie set and go back to movie list, there is no problem.
But when using custom menu based on smart playlist, you enter the movie set and then press backspace, to return to first movie in smart playlist list and all moviesets are flatten :
Movies level, movies group into sets :
Enter movie set :
Press Backspace to return to movies level, view is reset to first movie in playlist :
Movies in set are flatten :
Don't know if it's a Aeon Nox bug (but this beaviour also append on Aeon Nox Shedrock mod) or in Helix 14.1 (but as you can only use smart playlist from Videos menu and not create custom menu is hard to say).
I hope Phil, which is the skinner and part of Kodi team, will point out the guilty