As an update to this, and further reason not to indicate preference this early...
Hofstra has an incredibly ballsy waitlist survey that you are "strongly encouraged" to fill out, which I read to mean, "If you don't, you ain't getting in!"
On this peerless form they ask:
1. Current CYMS selection (plan to enroll, commit to enroll, no selection made yet);
2. It then asks about your status: a. interested with no other offers, b. interested with other offers, c. withdraw from waitlist;
3. If you have other offers, they have the continued chutzpah to ask you to specifically name each school you have been accepted to and whether you have selected plan to enroll at each of those schools;
4. Finally, whether you have offers or not they then ask you to select any or all of the most important factors to you (Financial aid, Curriculum, Location, Other) and provide a box for a narrative on your decision making process.
So it is definitely better to be able to tell pushy schools like Hofstra that you have not selected plan to enroll anywhere. Which is just another reason to wait.
As an aside, and completely unrelated to this topic...I'm not going to lie: This offering of a WL spot and then pressuring you to divulge information AMCAS doesn't require you to release until a much later date in order to have a chance to get off the waitlist leaves a very bad taste in my mouth. It's almost duress and seems to be a thinly veiled attempt by Hofstra to make an end run around the AMCAS traffic rules.
Obviously there is a reason for Hofstra's unrivaled nosiness: They are a high stat loving medical school super concerned with yield. The WL for them (like so many schools) is clearly a yield management tool. They don't want to make any admissions offers from the waitlist unless they know it will be accepted. Hofstra is the only school on my list that had the audacity to ask for information I'm sure every school would love to have if they could get it. So while I find it extremely distasteful and off-putting, I guess kudos to them for having the cojones to ask.
But I think I'm keeping my information to myself, especially since I'm on Hofstra's 2nd tier waitlist which shows they have little serious interest in me!