Maybe this one can be sort of spoiler picture, but I don't think that Kishimoto will allow this two meet each other in the battle. Sad but true, I think that Kishi forgot about Anko... I rnow that she would be kind of waste in the manga but... she id really cool!
Anyway, this is a battle Anko against Kabutochimaru... more Kabuto with some kind of Orochimaru features. And their death, 'couse Anko had used Twin Snakes Mutual Death Technique.
Anko, Kabuto, Orochimaru (c) M. Kishimoto