This well made report dates back to 1946 but I think it can give a good idea of what the soviets could do with cavalry even in T2K. Building such units would prove, however, more difficult than in WW2. Nevertheless, these tactics were still taught (as military history) in soviet officer school and the return of cavalry would be more in the tradition of the soviet army.
http://www.lonesentry.com/articles/cavalry/index.html