One of the things that is being added to Fable 2 is a dog. I read this when it was first revealed and missed the relevance. I was "ok cool, another pet like in Black & White" yet I had forgotten that Peter has been tackling the issue of companion interaction for a few years now and this has resulted in the dog having three prime directives.
1. Don't piss the player off
2. Love the player
3. Don't hurt yourself
This might sound simple, but directive one requires the dog to not only stop getting in the way of the player (unlike what happened to the NPCs in Half Life 2) but to also be so useful that the player will enjoy having their dog around which aids directive two in that the player will eventually become emotionally attached to the dog wither they intend to or not. This emotional attachment is something that has been talked about in past GDCs and although there are many games that make players express a wide range of emotions by design, no game has conquered love by design. Some have come close, but nothing like I think we will see in Fable 2.
Anyway you can watch the full presentation about the dog and other stuff is Over at IGN and I am very much looking forward to a return to form for Molyneux. And the worlds first video game where the player can become pregnant.