Spontaneous summoning ... whoa.
Tweaks to castable spells, OK; wild shape adjustments, fine; animal companion rules look more focused (hard to tell without the sidebars, though).
But spontaneous summoning ... whoa. Good wilderness flavor, that. As to power, *shrug* wait and see.
Druid weapon comment: no they don't get proficiency with new weapons, but they don't lose their abilities for using a prohibited one, either. Seems a reasonable approach, given that weapon proficiencies are arbitrary anyway.
Edit: As to the illustrations ... certainly appropriate for fey, and much tamer than my 1e MM!