Regarding The Last Guardian, Ueda said that he believes the Tokyo Game Show trailer was able to show realistic animal-like movements of the massive Torico creature. However, there are some areas where he's not satisfied with the variation, so he expects the quality to improve further
As Ueda has said in past interviews, Torico will move of his own accord. However, they're making it so that you'll be able to issue simple directions to him. Torico has likes and dislikes (I'm not sure if this refers to just food or to other things as wel), and you can use these to guide him.
The boy and Torico will see their relationship deepen as the game progresses.
As for gameplay systems and so forth, Ueda wouldn't share specifics, saying that there isn't anything he can promise at this point as the gameplay areas could be changing in order to improve quality and make the game more enjoyable.
Fans of Team Ico should be pleased with one particular comment from Ueda, though. He said that he's aiming for something similar to ICO, so there won't be any clear on-screen gauges, and the controls will be kept from being too complicated.