Rumors from Faeit 212 under the break. 

Imperial Defense Line
Aquila Strongpoint
Firestorm Redoubt
Vengeance Weapon Battery
Imperial Defense Emplacement

via Old-Four-Arms on Warseer 
on the GW site in the description of the Imperial Bunker :

“The Imperial Bunker can be combined with the Wall of Martyrs scenery range including the Imperial Defence Line, Aquila Strongpoint, Firestorm Redoubt, Vengeance Weapon Battery, and the Imperial Defence Emplacement. The only limit to how big your Wall of Martyrs set can be is your imagination (and probably the size of your gaming table).”

Aquila Strongpoint, Firestorm Redoubt and Vengeance Weapon Battery could be the 3 new apoc terrain pieces…