After going through the contents of
Tata Sky+ website, it is clear that they have initiated the transition process. That is the reason they are offering exchange schemes for the existing
Tata Sky customers at 40% or 50% discount. I am sure the original price of the Set-top-box is not that high. May be the Set-top-box with DVR facility will be higher than the normal one. But TATA Sky want to capitalise on this new service (in literal sense pocket some money) before fully switching over to MPEG 4 service.
With regard to comparing Tata Sky and Tata Sky+:
1. Packages are same.
2. Set-top-box differs not because of MPEG 2 or MPEG 4, but because of DVR facility.
3. I don't think Tata Sky is beaming channels in MPEG 4 format if that is the case then the existing customers will not be able to avail their service as the existing set-top-box is not MPEG 4 compatible. Therefore the subscribers of Tata Sky+ have only the advantage of new set-top-box with DVR facility. If they have to receive channels in MPEG4 format then one has to assume that Tata Sky has started a new DTH service in MPEG 4 format for the Tata Sky+ customers. I don't think no one in his right mind will do this as because this is not cost effective.
4. In a year's time Tata Sky mayl introduce new set-top-box with MPEG 4 compatability but without DVR facility and this box will cost much less than the now offered premium set-top-box. And then they will also offer exchange scheme for the new set-top-box. One has to wait that to happen or put more money in Tatas pocket and go for the premium set-top-box.
5. Upgrading the software of the existing box is also an option, but one wonders whether it is possible.