To be honest I think so because when I farmed loremaster the first two times I got to dragonspyre I got winter moon and next fight got headless horseman. But problem with thoose spells are I'm a life wizard but i use headless horseman to help with removal and damge but yeah since Halloween is coming they probably made it little easier to get.
My Ice wizard got Headless Horseman as a surprise drop a few days ago. Could be a coincidence, but someone else in my farming group said they'd just gotten it that same day. This happened late last week.
My Death wizard has not been so lucky in her farming efforts, though she did win Savage Paw after two fights yesterday.