Since the event is going to be around for awhile we might as well have a place to discuss it..
Ammo: JOB-100 (first seen at Halloween this year) back in store. Good for the quick slaughter of NPCs if you don't of tonnes of other elite ammo at hand.
Quests: From the description in the quest FAQ, I don't like the way it's planned out. So far the quests seem to require travelling between uppers and lowers (easy & hard) and pay out pretty average. I foresee the waste of many jump credits
As the 'Super' quests are rolling in it's obvious to see we are being ripped off. The rewards offered are simply not good enough for the requirements we are expected to fulfil. The hard quests require an overly excessive amount of travelling and the rewards aren't worth the work (we are only up to the 3rd day and the quest already requires you to go from uppers to pirates to lowers). The easy quests are however, are worth doing since you are only expected to travel around your lowers maps and continue to offer fair rewards. Compared to the Halloween quests the easy quests are about the same in terms of WORK:REWARD ratio and the hard quests are simply not up to this standard. Extremely disappointing.
NPC: The Santa bots shoot lightning at you (extremely long distance) which screws up your controls (opposite direction) and can deal a significant amount of damage (depends on map). There is a chance however that you get turned into a little snowman (as well as all the NPCs/ships) which looks really cool ^_^ They aren't worth the ammo it takes to kill them. After awhile though these Santas do become annoying and you're better off steering clear of Santa :L
Graphics: There are these little igloo things scattered around the maps (several in each) which look pretty neat but aren't of any use. The sparkly snow at portals isn't all that realistic but it was a fair idea. NYX is dressed in red as I'm sure you've noticed. The backpage looks really icy and all the graphics this year have followed traditional themes
*NEW* Advent Calendar: First time this has appeared in Darkorbit history. During the lead up to Christmas you will be presented with a different gift (ranging between 150-7500uri) everyday.
Boxes: Look the same as previous years. As far as I can tell they seem to have the exact same content as Halloween, apart from WIZ rockets. I don't like how they're only out during select times, leaving some players that don't play on those times in the dust. All in all they are worth picking up while you are travelling from places or boxing but you shouldn't go out of your way for them when your doing something more important, such as hunting.
Will keep this updated during the event when additional stuff unfolds so players know what to look out for.