That isn't even a midget bonzai skill tree compared to PoE.
Skill tree in POE isn't that impressive in terms of different nodes though. 1200ish + nodes in POE. Remove mana, energy shield, HP, dex, str, int, +resistance nodes from POE, how many are left that are actually "oh this ties directly into a class build?" Though active skills may be different, there are tons of builds with near identical passive picks except some minor changes to fit the different active skill. How many builds for instance has the little square of the 8 hp nodes in their setup? Be that spellcaster, melee, bow, summoner..
From the looks of the icons of the tree for D4 it appears to be tied to one class. Wizard or something like that. See some fireballs, magic missile things, shield? frost/arcane?
So if each class has its own tree, then it at least is a step up from the limited Diablo 3. Appears to be around 70-80ish points. No idea how many classes there will be. Three are announced, so maybe 6? 420-480ish skills if each class has a different tree. Don't know if those nodes are all class specific, but if they are, and HP/mana/stats are tied to gear, not passives in that tree, then it really isn't that small.