Cordy, please God no! There have been some problems between Charisma and the crew last year, they even forced her to take time off, to take care of her private issues, but it seemed as though they were solved! Anyway if it is her, can Angel handle another love-loss?
Connor, he has only been on the show for a short period and if they knew they would kill him, they would have made him a regular and put him in the opening credits.
Fred, isn't part of the cast for that long either! It could explain why she wasn't in the photo-shoot as an individual! It was pointed out by Amy Acker, that she and Gunn were going to have some difficulties, and something bad would happen to Gunn!
Gunn, he already had a heartstoppage in 4.02 "Ground State" which might explain the whole spoiler. And I don't supposse that really counts as a death. Though when Buffy had to be reanimated in 1.12 "Prophecy Girl" she was dead for a split second.
Lorne, does Angel really care about him that much? Well he does a little and in the light of the knowledge Lorne has of what is to come, somebody might decide to put him on a silent track!
Faith, since she will return to Angel mid-season maybe it will be her, Angel cares for her, however she will be on the last 5 episodes of Buffy Season 7, so it's highly unlikely!
Angel, well let's not forget him, he's is supposed to be turned into Angelus mid-season to defeat some demon thing, Faith is called to stop him, so maybe she accidently will kill him. Off course they'll bring him back in someway!