Rackham have released some more info about the upcoming AT43 Expansion Operation Frostbite.
The extract of the PDF in CH 92 are:
Civil Engineers who appear to be mobile Battle objectives
Combat engineers can lay minefields (AP and Anti Personnel)
New Combat Routines
New rules for Support Units.
Support units are partly or entirely composed from the contents
of an Attachment Box.
Support units are used to fighting in small numbers. In regards
to Morale rules (see The Rulebook, p. 74) , they are considered
rank 3 units: They only roll for Morale when there is
only one fighter left.
Not exactly much to go on there eh guys where’s my Red Blok 120mm Mortars!
The Full PDF here