I wonder if some druid decks will run poison seeds seeing as how handlock and giant decks may see a comeback. I have seen it maybe 2 or 3 times total. One time I was playing a demon lock and it screwed my molten giants pretty hard.
re: freeze mage
They actually did add a couple cards that hurt freeze mages.
weblord, makes alexstrasza unplayable while on the board.
wailing soul, unfreeze and slam for a lot of damage
loatheb, obvious reasons
A lot of deathrattle minions which are strong vs board clears.
A few thoughts about weblord. This card might actually be pretty good post nerf. Some people are claiming zoo is gonna be a big thing again, and if handlock is a big thing as well, weblord is actually a card you can mulligan for for both match ups. It makes turn 3-4 twilight drake impossible. It also makes alexstrasza unplayable, and even possibly screws up defender of argus and sunfury protector plays, as well as screwing up the still popular turn 5 azure drake (even though sludge belcher is still pretty big). And zoolock will have quite the difficult time playing their minions since many of them are battlecry.
And it even stops grom/task master combo. I think the card is under-rated. 1/4 stats are fine too.