Elemental Evil Player's Companion PDF released, for free

[Demonic Spoon]

A couple more points: First, someone said that they were glad to see that this supplement didn't have powercreep in it, but supplements like this are exactly how powercreep happens. It introduces some new stuff, some of which is a little worse than what came before, and some of which is a little better than what came before. Overall, it's at about the same power level as core, so it looks balanced. Except that's not the way it's actually going to work out: The things that are underpowered, nobody's ever going to take, so they're irrelevant. The things that are more powerful, everyone's going to take, so everyone (or at least, everyone with access to this material) will get a little bit more powerful. Repeat with every new supplement, and eventually you start noticing that everything's a lot more powerful than it used to be.

I haven't found anything in the PHB or the EE that is bad enough that no one would ever take it (with a couple exceptions, mostly nonfunctional rules like Grappler).

Power creep happened in 3.x because splatbooks specifically created new mechanics with the intention of changing balance, and feat choices that were actually designed to increase the power of certain kinds of characters (in addition to being terribly balanced). Also, 3.5 balance was arguably at its worst in Core, and WotC clearly tried to fix that in splats, which means that they were intentionally engaging in power creep.

Finally, the intention isn't that every option from every supplement is available in every campaign. The last sentence of the first paragraph in the EE supplement even says that these are character creation options if they're allowed. Several other parts of the supplement also offer similar disclaimers - for example, the druid spells list has a disclaimer that the DM will probably at most give access to a small subset of the new spells, and that you probably don't have full access to everything.