Yes. The new keyboard would replace the Apple keyboard. I hope they also make a matching mouse to go along side. The mighty mouse is OK, but I'd like something new. Maybe they'll announce the rumored "Multi-touch mouse".
I hope they continue to sell the current keyboards - I love them. I don't think I'd like a slim keyboard - I don't care for the MacBook keyboard all that much, so doubt the new keyboard will be all that great for me