Only if they choose to drop them, there is nothing about eBay that encourages or forces a price drop. Leading up to Christmas, I'm sure many sellers start to break out the steals and deals for potential customers.
Yeah, like I have a few collectable toys and such that I've been holding aside to list on ebay around the holidays. I assume that many other sellers probably do the same thing. So you may see things on ebay around the holidays that aren't very common, and usually at lower starting prices too