Hardpacked snowballs are too sparse since the av change. They are my favorite feature of the holidays. Maybe other holidays could follow suit and add new wrinkles to battlegrounds.
I would like to see more festive mounts for each, more quests and achievements, maybe do more stuff like they did with the SoO bosses having hat drops. Would like to see them more of a bigger thing then what they are, because for me once im done it once, i almost ignore it next year. Needs to have more of an impact. With garrisons coming maybe they can have something cool to tie in with that (like themes for your house or something!)
I too would like to see the holiday random epic items be boa instead of soulbound. Would alao like to see their item level be in line with the current tier's highest available items of either LFR or normal difficulty.
I'd just like to see an entirely new seasonal event added since I've completed "What A Long Strange Trip It Has Been" so there's not much to do each year when they come around again.
I would like to see new things added more often to all the holidays. maybe give some of us long time players a reason to do them again. At the moment, they add stuff in at an abysmal rate.