"Normalizing" a character like Rosalina by stripping her down to sports wear would be plain weird, if you ask me. It does not fit the character, so I find her wearing her traditional clothing and commanding the golf club rather than using it herself to be a far better representation of the character. She's not just another one of the princesses.
Wait, have they released any video footage of her yet? So are you saying she uses her wand to magically control her golf club and swing it that way?
If she floats too, like the queen tyrant descendent from the heavens that she is, all of my complaints about her not wearing sensible sporting attire will go out the window.
I plaid the demo and unsurprisingly liked it a lot. The one thing I didn't like was having to press the touch screen for the different spins after you hit the ball. There are button prompts for each of them, but doing the super topspin and super backspin (AB and BA respectively, I think) was impossible for me to get down consistently. I assume you're supposed to press them in quick succession but after trying that several times and failing, I just stuck with quickly tapping the pad.
I've tried the ring challenge about ten times and still haven't beaten it. I like how they throw in something that's actually challenging for the demo.