Sorcerers and stats

Hey guys, first I don't post much but I read these forums religiously and most impressed with the quality of post and answers.
Second I've played a lot of Baldurs gate and can wait for release of enhanced.

So heres my question. Will sorcerers spells be based on there charisma score, as it should in DnD rules or intelligence.
I believe it used intelligence in Baldurs. With either, will there be bonus castings per day for high stats.

And..Can a sorcerer use the ring of wizardy?

Thanks in advance for any replies
As well a very big thanks for all those people working on this game and making this happen.