After watching the promo for "Crossfire" I think Airachnid may be the one to die. Consider this, Airachnid is obviously trying to betray Megatron again and maybe get revenge for the humiliation Soundwave put her through at the end of season one. Megatron if he's FINALLY learned anything from Starscream, would not put up with this and exterminate her. Also doing so would put Dreadwing up for SC as explained in his cyberverse toy bio. Besides that, Airachnid has not had that much significance within the plot besides just a revenge subplot for Arcee. And has otherwise been more then a distraction for the decepticons.