They already have the editor with expansion units. I cant imagine its all that hard to get the new 306 heroes into the editor, though i dont know how so i may be wrong.
Not to mention using the War3x.mpq is now pointless because blizz is using the war3patch.mpq now.
I want world edit for TFT too, and the one made to work with the current patch would be nice, btw UMSmaps.com is no more, I hope UMSWE isn't discontinued.