My take on the Foehn origin missions is as follows:
1) Nobody Home: The Proto-Foehn forces (consisting of what Foehn units we saw in "Noise Severe") led by Yunru attack an Epsilon base in Kashmir while the bulk of their defense forces are busy fighting elsewhere during the events of "Noise Severe". After the mission is complete Siegfried and his Chrono Legion chronoshift in. Siegfried has recognized that the Allies and the Soviets will lose to Epsilon unless they unite but has failed to convince the Allied leaders to seek a temporary alliance with the Soviets and as such has taken matters in his own hands, using his Chrono Legion to convince isolated, leaderless pockets of Allied and Soviet forces (including some Kanegawa Industries scientists still trapped in Japan, explaining how the Jackal Racer got into Foehn hands) to converge on a hidden base in Point Hope, Alaska which will serve as a staging ground for a "revolt should Yuri's epsilon army prevail over the free world." Yunru accepts his proposal and her small army is chronoshifted away (explaining Foehn's access to the units and the nano-technology that created them).
2) Kill the Messenger: One soldier in Bastion base deserts and attempts to make either the Allies and Soviets aware of the Bastion base's location. Not wanting the location of the base to be compromised, the player is tasked with finding and neutralizing him before he can rendezvous with his side's forces as they patrol the area.
During the mission the player is given brief snippets as to what is happening during the events of the final missions of Act 2 maybe in the form of scattered communications that Foehn's advanced cyberkernels can just barely detect.
The "Conscious Slumber" may refer to how most of the free world is no longer in control of their free will, and is now under control Yuri's control. With a vast majority living their lives not thinking for themselves but for Yuri, the event might be hinting that the Mental Omega Device, rather than using brute-force mind control, inhibits free thinking of the many affected and links them to a semi-hivemind, living out their fantasies and desires as the rest of the world withers in the psionic storms that ensue (a probable side effect of the Mental Omega Device).
As somebody else already pointed out "Babel" the final Epsilon mission's name does not refer to the Babylon tower but the event when God forced everyone to speak a different language and broke man's unity. Maybe the Mental Omega Device gets damaged in the fight (or maybe it was never going to work as intended due to a design flaw) and malfunctions, instead of creating a global human hive mind led by Yuri as a hive queen, the Device instead creates the Conscious Slumber as described by Sven and psionic storms that wipe out most of Epsilon's leadership including Yuri and the Player's Proselyte.
As the player discovers this mess, we finally arrive at:
3) The Remnant: The player is given the task of linking up with the damaged Paradox Engine and survivors from a Soviet naval fleet in the aftermath of Act 2. One of my longstanding theories about the final missions of Act 2 has been that the Paradox Engine will malfunction at the worst possible time and deny the Allies victory as their "Hamartia", their fatal flaw that leads to their downfall, is their over-reliance on the Engine and its temporal manipulation abilities.
As a result the survivors are brought into the fold, temporal manipulation technology is deemed too unreliable for Foehn to continue to use but the Engine's prototype wind manipulation tech that enables it to fly (my explanation for the vortex underneath its in-game model) is still viable to develop and improve upon (hence the Tempest Architect, the Windblades, the Windtraps and the Zorbtrotters). The Engine is repaired and re-christened "Coronia" (I agree with Sven that this is the likeliest origin for the thing) and the Foehn Revolt is finally created to find a way to destroy the Mental Omega Device and succeed where Foehn's predecessors could not and defeat the remaining Epsilon forces that now control most of the planet, leading to the Foehn Campaign.
So I'm under the impression that the mission Kill The Messenger will involve a traitorous soldier? I wonder how will that go about?
"During the mission the player is given brief snippets as to what is happening during the events of the final missions of Act 2 maybe in the form of scattered communications that Foehn's advanced cyberkernels can just barely detect. "
Will these messages start popping up as soon we build the Cyberkernels?
Also wondering if the first mission Nobody Home will be a units only mission or will we have access to a base?
My bad 
