Well not really. The problem in skill diversity in median isn't caused by limitations but rather, the low amount of decent skill/missile functions that there are available.
Skills will be one of the lowest priorities for the first sigma versions. For the first alpha, the biggest reworks will be seen on the levels, maps, regular monsters, cube recipes, items and uberquests. Several uberquests will be removed (brachy, infernal machine, etc.), several quests will be reworked from scratch (lesser prime evils: Azmodan & Belial), uberquests will be moved outside the main storyline, tiered item count will be reduced to 4, one-of-each sacred unique will be removed or will replace a removed tiered unique (because Jitan's Kamon+deadfall has become unoriginal). There will be new uberquests. Dogmas will be removed because they're not fun. Most forms of item rerolling will be gone because horadric cube is taking way too much time of our lives. I can go on for an hour but my point is, no don't expect a new character tree, at least for a while.