my assumption is: (i dont have any knowledge about satellite technology.but it is only my prediction).
1) As per scrolling in DD national, new frequency for their channels will be 3885. But none of the frequencies are matching with this.So these frequencies are not for DD.
2)May be TS testing their TPs in C-band(i dont know whether it is possible or not), so that to keep it as secret untill regular testing.
3)If these TPs are for TS, then One TP will be used for HD channel addition, and the remaining two for SD channels.
4)If all my above predictions are true, then we will see channel addition very soooon.
All these are only my assumptions.