The new Deathwing box is what has me most excited. If the new Deathwing terminator box is similar to the Wolf Guard terminator or Grey Knight terminator box it's going to mean a lot of extra bits which I can use to customize my spare Dark Vengeance terminators and maybe even the marines and bikes too.
Seeing as I play mostly Deathwing the rest of the new kits don't matter to me as much but I am looking forward to maybe picking up the new Ravenwing flyer and maybe one of those freaky looking land speeders for completion's sake. I will probably stay away from the new character models though as I have my own Belial which I have been using for years and I've custom made a Sammael on an attack-quad to represent his jet bike form.
Definately looking forward to the complete rules on the Deathwing and the Deathwing Knights. From what has been rumoured the Knights are quite a force to be reckoned with. Hopefully they aren't too expensive in game to make them unfieldable, would be a shame considering the models look pretty darn cool although I would replace the hooded heads with full helmets; probably a Grey Knight helmet as I have a bunch of those from when I made Belial's command squad.
Some people are worried the Deathwing will lose their Fearless but I think the new Inner Circle rule will give them Fearless (as all Inner Circle in previous editions were Fearless) and possibly something else (probably wargear related or a chapter specific rule that affects Inner Circle and non-Inner Circle units). Really curious to see what kind of Chapter Tactics rule the Dark Angels get and if the normal marines get anything nifty. Mind you, since the Dark Angels are just like any other marine chapter aside from their 1st and 2nd companies, I don't think I'd mind if the regular tactical, assault and devestator marines don't get anything special. After all, it's the Deathwing (and the characters who are part of the Deathwing) and Ravenwing that make the Dark Angels unique.
Anyways, looks like my hobby money will be spent once January hits.