Out of all the operators, MTS will get back the spectrum at a cheap price(base price to be assigned by TRAI) since there'll be zero competition for CDMA spectrum.
I expect neither RCOM nor TATA nor BSNL nor MTNL to bid for CDMA spectrum.
Now, it's imperative upon TRAI to complete the auction process within the grace period of 4 months in order to avoid trouble for subscribers of prospective re-winning operators of shifting to other operators during interim period.