Yayyyyyyyyyyyyy!!!!!!!!!! I think they want a "guess-timate" weight for the form to be able to pick classes - but they'll weigh you once you get there & make the final decision then.....
What's really amazing about it is that I'm wearing a size 5/6. Provided, of course, that my thighs fit in that size. Otherwise I have to wear a 7/8 and a belt. I've resorted to wearing a lot of warmup pants. I bought a bunch of Otomix pants at the O. They were 3 for $10.