Talson said:
Flemeth's a shape shifter. In DA:O you saw her as she appeared to most people and, assumable, Morrigan most of the time. In the demo, she just transformed back from her dragonic form to investigate how a bunch of ragamuffins could take down an Ogre. She changed her shape to fit the occasion. Either that, or someone told the character designers/modelers to have a bit more fun with the way people look in this game (Isabelle and the dwarf support this idea, as does the horned guy from the cinematic trailer).
EDIT: Remember guys, Isa was in DA:O she was the lady in the Pearl who taught you to be a Duelist.
I understand that is a viable explanation for the change; the true extent of Flemeths power was left ambiguous so she could conceivably be able to alter her human form (Even though Morrigan specifically tells you it is not possible to shapeshift into different human forms).
I just think it's a bit weak. I mean it's different with Isabella in that while her general appearance and voice has changed the core character is essentially the same. But with Flemeth, she was always portrayed in the first game as someone who hid her true power and motives behind a veneer of senility; this new interpretation of Flemeth seems less subtle.
I'm just hoping the writers were able to explain changes between the games in a way that is believable for the character. If they can do that I'll be one happy camper.