I'll try and describe it for you. All the units and structures are in the game and functional. This is a huge plus when it comes to play balancing and polishing. All the game functionality for the shell screens, the game editor, etc is all in. We are looking very good and it gives us time when we can just play the game to see what works and what doesn't.
Psychic power is just one tech path they chose to follow.
Imagine that you've spent a lot of time and money on a Weather Storm only to find that it was fairly ineffectual against your enemy. To us this is frustrating and not the type of game we'd like to make. RA2 is all about big weapons, big action and big payoffs. Currently they aren't planned for. Since the Soviets lost the last war they have revamped a lot of their tech to help defeat the Allies.