This is what I've done so far. All four sides are playable in multiplayer and skirmish. The new units are NOT permanent, graphics and balance is still...
Since I can't seem to be able to upload videos on modDB (I get all kinds of errors, and I can't sort it out now), I will put gameplay video links here:
Tiberian Origins lets you play as the original Red Alert (1) sides - allies and soviets - as well as the Tiberium Wars sides - GDI and NOD - in skirmish, multiplayer and singleplayer campaigns.
All four sides include their original units and structures, plus a few new ones (for campaign and multiplayer balancing).
The campaign will contain several missions for all factions, with Allied / GDI missions bundled together, and individual NOD and Soviet missions. It will tell the story of how tiberium arrived in earth and how it was discovered, it's weaponization, and how it later threaten the planet's population.
The Allied campaign shows the creation of Spec. Ops 9 witch later becomes the Global Defence Initiative, and it's fight against NOD terrorists.
The Soviet campaign revolves around the fall of the URSS - featuring several ex-soviet states struggle to remove what's left of the old regime, and their fight for independence.
The NOD campaign entails the Rise of the Brotherhood, as Kane manages to rally some of the ex-URSS states to fight for his ideals.
The unit is designed as an armored anti-infantry/building vehicle. It's slow to move and turn. Fires an HE shell that is devastating to infantry and buildings. Shorter range than the allied artillery, longer range then a tank. Best used against bunched up infantry since it does loads of splash damage.