There definitivly will be some new things but it looks like good old 1st edition with d6 dices, which i prefer. One for sure - they have to come up with something for the Broodlord becouse it's not a 1st edition Patriarch - which was rather a sitting psychic cannon

Also there's a CAT unit, dead marine and a relic - so it implies that the classic mission will be among those twelf they annoaunced.
PS. anyone else pretty disturbed with Blood Angels dead count in their first boarding attemp? I mean we're talking 950 Terminators...whoa...They don't even have that many...And that's like almost a whole chapter butchered

That's the same story from the 1st ed rulebook but I just remembered how huge that number was.
EDIT: I just read the 1st ed. rulebook again and remembered. Indeed 950 is the dead count resolving almost in a dissolution of the Blood Angels chapter. Although ovcourse most of casualties were normal marines, terminators also suffered heavy - at the end only twelf of them were aible to fight back.