http://uk.wii.ign.com/articles/726/726748p1.html
Brief synopsis: At E3, swinging Link's sword was mapped to the B button. Now, it's mapped to Wiimote motion. No word on whether or not this is a changeable option, but it's possible. Also, at E3 you had to use the Dpad on the Wiimote while aiming to fire the Bow & Arrow, which some have said was awkward. That's the B trigger's new function now.
This could be good, it could be bad. At E3 Nintendo was saying they didn't want to have the sword controlled like that, because they thought it would get tiring. I personally am not too worried about 'arm tiredness' with the Wii--if it happens it happens. I'm more worried about the people who pick out that part of the system's feature and rag on it.
Changing the arrow shooting to the B trigger was definitely a good move though.