Most likely, they will move several two-dish markets to the side slots.
Example:
Las Vegas shares it's spotbeam with Bakersfield. A second dish is required in Vegas for one channel. Since the Bakersfield DMA is much smaller, they'll probably move all of Bakersfield to 148 and move the Vegas channel over to 110.
Fresno shares it's spotbeam with Santa Barbara. Either SB or Fresno moves to 148 allowing all of the channels to either be on 110 or 148.
Sacramento shares it's spotbeam with Salinas/Monterey. Sacramento gets 110 and Salinas/Monterey gets 148.
If all of your channels are already on one dish, nothing will happen.