To answer what factions are going to be in the mod.. again
Federation, Klingons, Romulans, and the Borg will be separate playable factions. The Dominion have combined Cardassians, and Breen "battle thralls". Being that the mod is set during a non-canon "second dominion war" (lore being worked on). With the Borg crashing the party. Cardassia, and Bajor are re-conqured. DS-9 is destroyed, and the Dominion control the wormhole. Rather than annihilating the Cardassians for thier betrayal during the 1st dominion war. The Founders enslaved them. They had a choice. Fight for the founders, or die. The Breen were more than happy to re-join thier old allies. The founders dont care how the Breen feel as long as they fight.
The Federation, Klingon, and Romulan relationships became just a little "frosty" Since the events of Nemesis. The Klingons did not like the peace overtures the Federation were making toward the Romulans. The Romulans being masters of subterfuge took advantage of the situation, and caused a few "accidents" that looked like were caused by the Federation.
When the Dominion broke the cease fire, and pored through the wormhole like a tidal wave, no one was prepared. DS-9 was the 1st target, and was easily destroyed. Then a three pronged assault on the 3 alpha quadrant powers ensued. Each faction is able to just barely hold thier own against the dominion onslaught. The Dominion is firmly entrenched in the alpha quadrant with endless re-enforcements via the wormhole.
Meanwhile numourous transwarp signatures are detected. Thousands of Borg ships exit a transwarp network that was not as damaged as previously thought. The newly emboldened Borg collective now deems the Alpha, and Beta quadrant races the most serious threat to thier existance. Diplomacy is irrelevent, Co-existance is irrelevent, Assimilation is irrelevent. Only Annihilation is acceptable. This time with not just one ship, but the force of the entire collective.
Welcome to a Star Trek Universe in a state of Total War. Welcome to SoA 2