"Escape to Salvation" - "Magnificent Retreat" [Campaign 4, Mission 4]

There is also an additional mission called "Dark Messiah". The participants are the son of Isabella and Kha-Beleth, Arantir, and Kha-Beleth (in the dialogues). Direct link to the Russian version of the "Dark Messiah" mission (news from January 7th) - http://heroes.ag.ru/heroes5/news/2008/01/