They've been around for a few weeks now. Don't know if they're literally new replacement levels or if King just went through all the "Super Hard" levels and re-classified some as "Nightmarishly Hard Levels"
@Elsa have you had the "Seasons Stockings" kinda mini game appear in the last couple of hours? It didn't appear for me at all over Xmas and New Years which makes me think that King are running behind with updates (at least for the Facebook version)
I think they've done an update as I'm sure that a couple of the animations have changed on the facebook version. @Elsa what version/platform are you playing it on?
King still need to deal with the bomb timers for the level, it's pointless the level having bombs if they've no chance of going off before you run out of moves
35 Jelly to clear, 12 moves available and the countdown on the bombs is set for 15 moves! Funny thing is just before typing this I attempted the level and beat it. Just pot luck with the wrapped candies getting two next to each other and having a lollipop hammer allowing the creation of a colour bomb
I wish that the wiki had a page for Candy Crush with a table covering absolutely every new item (candies, blockers, etc) mixed together but in the order that they're first encountered