It was mostly rebalance work to make some of the classes and reworking on the damage reduction. Also they made the MM critters more streamline and uniform with each of their types. If you have the 3e books you don't need to buy the 3.5e books. Just get the up to date SRD and apply where needed.
Ravenloft has a 3e campaign book and a 3.5e player's guide that updates the portions of the campaign that needs it along with new material.
You had to first break into Ravenloft.
It was a very convoluted plot to stop Vecna from becoming an Overgod like Ao or something or other. Its been a while since I have read through the module.
What I would like to see is a multicampaign Dungeons and Dragons adventure similarly done in Die Vecna Die. You start off in Greyhawk, find your way in Ravenloft, once escapiong Ravenloft you face the main bad dude in Sigil.
Sarcasm in this is not appreciated. Mods are just mods, Hurlshot and we are not talking about mods. We are talking about the base game. If you want to talk about mods make a new thread.
In any case I doubt a port over to X Box 360 will happen. If they aren't going to make Linux or Mac versions i doubt they will make a version for a console.
In Bioware's case it was too little too late. They had a huge SP community with BG and BG 2 and they turned their backs on us with NWN and only gave lip service with one expansion.