Anyway, that would probably be a good idea for a book. I would most certainly be interested, as we run a campaign in which everyone's a sorcerer (usually multi'ed, so we can all get the shaft equally).
Yes, we certainly are (and to reiterate, we'll be doing all the core classes and a few other interesting ideas besides). The Quintessential Sorcerer will be released in the middle of next year.
You should really bring the book out sooner than the middle of the year. That is one book I have been waiting for more than any other book and I would love to get it.