I'm voting yes, but tentatively. I'd love to see all the character classes as companions, just for maximum flexibility. I'd like additional wilderness areas only if they can be well-fleshed out and meaningful. If they're just there for me to slog across, then no matter how pretty I wouldn't want that.
But all of this is contingent on not delaying the game release too much, as others have also said. I don't want to see a net schedule slip of more than a couple months, it's just not worth it. It can wait for an expansion better than delay the game. I know making games takes time, but oh how I want to be playing this one!