Usually d2h fills up all the TPs. No reserve spaces.
Here's my estimate.
11164 V => 6 HD space + 6 SD space or 30 SD space
11148 V => 5 SD Space
Remaining TPs => 15 SD space (approx)
This should be more than sufficient for the channels to add this year. Hopefully they should have enough money by the end of the year so they can buy new TPs. They already proved technically its possible to realign TPs on ST2. Should see if they can do it again. The satellite life time is 15 years launched in 2012. They should have no issues until 10 more years.