Check out some of the work done for the new release in this link: https://www.moddb.com/mods/cc-red-alert-history/news/release-7-general-changes

The Allies getting the Harrier has made a big difference! however, without the Chronosphere, the Prism tank does not feel as broken as it did in RA2.
Furthermore the Mirage tank feels like it has an odd balance. It is either not strong enough (in the context of the Soviet arsenal), or is more likely, too strong in the hands of a good player. Will be interested in feedback on that.

The Soviets on the other hand have it all good! They have a V3 launcher with an unstoppable missile, the Multidrone is a very useful addition, and the Tesla tank really fills a gap that the Soviets had, in direct contrast to the allied additions, were there is only one case, and that was the filling of a glaring omission (the afore mentioned Harrier).

The increased passive abilities of the Iron Curtain, makes it a very useful structure. Of course in some theoretical future update when (if) the Chronosphere got added, the updates that got in terms of time released support powers and maybe passive abilities would be interesting as well.