Technology (1) : ZIBRA suits.
If you are in an area containing X infantry units of an ally and this ally has this ZIBRA suits technology does this prevent X Zs to conduct their ‘Zs Attack’ attack (Phase 2)?
My guess: yes, because of the analogy with destroyers and subs.
Technology (2) : Z-4 Explosives
If you are defending and your ally that has one or more artillery units does your units hit Zs at a 5 or 6?
As opposed to hitting them only at a die roll of 6.
My guess: Yes. As the artillery units of your ally take also part in this combat.
If you are attacking Zs in an area where your ally has artillery units do you still get this Z-4 bonus?
My guess: No. As the artillery units of your ally do not take part in the very combat.
Maybe again the submerged submarines analogy can be useful here. But - as in all cases - waiting for the official verdict.
PART TWO in a seperate post (see below).