When the videos first came out there was some negative feedback on the somersaults, and the Larians said they would re-examine the issue (they have not mention if they made any changes). I didn't care for them (though it looks good as part of the jump attack), but figure they would be easy enough to get used to and ignore after playing a bit. In an case, you will not have to jump around as much as was shown in the demo.
The high agility is by design, and part of being a dragon slayer.
