I could be potentially interested.
I see wizards being more studious while warlocks get their powers from making deals with dark forces. Sorcerers on the other hand have innate talents.
So, wizards do (not) require talent, but spend time learning a lot. Warlocks summon, bind, or otherwise deal with other beings. Sorcerers . . . by innate talents do you mean like "fantasy supers" or sort of wizards on steroids?
Also, any specific limits to what sorcery, wizardry, etc. can do? And, finally, because it's one of my big interests, any werecritters and rules/whatnot regarding them?
As far as system v. freeform: either's good for me. They have their pros and cons . . . for instance, about the only system that's not setting specific I'll play is GURPS (3rd ed by preference, 4th I can muddle my way through). Systems give some hard and fast numeric differences between power levels (and potential OOC arguments about rule technicalities). On the other hand, freeform tends to draw more players (and potential OOC arguments about what characters do).