The UC side of the Earth Federation really relies on it's base line mobile suits to win the day. Where AW will have mass production gundams with abilities and SEED will have massive mobile armors to win its battles the UC forces really have to use their wide array of mobile suits to push through. Thankfully they have 3 different systems working together to allow them to get the most out of their forces.
The first system everyone already knows about, the DefCon system. This system works a lot like the old Timeline system did. The player has 2 ways to advance the Defcon system compaired to the Timeline system that only had the one. The first is just wait, as the battle progress's the UC high command will decide that the commander will need more advance tech to try and win and will not only allow you, the commander, to deploy newer, stronger suits to the battlefield but will also drop in a special "Command" Gundam mobile suit with a team to help assist. This is how the UC player gets access to Gundams in the game.
The 2nd system is the Retrofit System. At Teir 4 the Research Center has new upgrades avalible for research that will upgrade older mobile suits to new uses on the battlefield. Some upgrades, like the GM-III Retrofit, will upgrade the original RGM79 to a fully armored GM-III with a bazooka and anti-air missiles. We're still working on what upgrades we're going to do here, but at the moment we've got the GM-III retrofit, the Guntank Repair retrofit, and the RX-77 Guncannon 3 Retrofit in the works.
Finally there is the Project Hazel Retrofit. At Tier 4 (or 5, haven't decided yet) the Hazel Research Center becomes avalible to build. Inside will be 4 upgrades that will again increase the power and usefulness of 3 different units on the battlefield. There are actually 4 upgrades that can be done here. The major difference between the Retrofit and the Hazel systems is that the Retrofit system can drastically change the way a unit works on the battlefield where the Hazel system keeps the unit in its same roll just with more abilities to get it's job done. What we have here so far are the Powered GM Hazel Phase, the GM Sniper Hazel Phase, the GM Custom Hazel Phase, and the Hazel Retinue Phase.
The Powered GM Hazel gains accuracy with it's main beam rifle (which is also stronger than the original), gains a bit more speed, and gains anti-air beam cannons on it's back. The GM Sniper Hazel gains stealth (which is a big plus) and a more powerful beam rifle. The GM Custom Hazel gains a nice boost in health, speed, and a stronger beam rifle. Finally the Hazel Retinue is for the Gundams. With this upgrade special "dual shield" GM Custom Hazels will drop in with the Gundams. These special units will be as strong as the RX78, if not stronger depending on the situation and be equipped with 2 short barreled beam rifles.
So hopefully you can see how UC will play out. Not only do you have what we mentioned above on UC's side, you also gain powers based off of the Gundams that are on the field and the Gundams give "strength" bonus's to diffent class's of units. I hope you guys enjoy UC, it's really turning into a very unique army all it's own.