I reeeally like the new system, you will be able to make some different/strange decisions depending on your playstyle/setup, which could eventually lead to more variance in comps (WLs have to choose between SF or mass fear, mages between cone of cold or ROF). I think there will be also cookie cutters, but it'll take longer til players will figure it out or you could have some real alternatives if they balance it right... and balancing could become a nightmare with a new class and 3[talent trees]*3^6[possibilities to distribute your talent points](?) new possible speccs.
Maybe there will be comps like Wl, Wl, Healer to cover all strong talents WLs can bring to your team, dunno...
Edit: Real hybrid speccs are possible again!