I'm looking forward to the new book. I'm not fond of material that's reprinted but updated material isn't quite reprinted. Yes, it'd be nice if they updated it on the website but I can understand where they're coming from.
I haven't seen a lot of companies updating their 3.0 books to 3.5 and giving it away on the web. Be nice though.
As far as preference for core vs. prestige, give me core. I see no reason why some concepts like assassin, healer, warrior-mage and others have to be PrCs. It makes PrCs almost stupid in some ways as they've been done wrong so many times with assumptions that these PrCs are numerous in guilds, organizations, etc.. when that would defeat the whole point of it being prestige in the first place.
PrCs are also boring. Outside of Legendary PrCs, what new has been done with them? At least Savage Species introduced monster levels as did Joe's Character Customizationbook. Heck, I prefer the advanced classes in d20 Modern as they allow a character to get into it quickly and thus take some of the 'sting' out of 10K PrCs. At least with an easy to enter PrC it's more believable.