Remember that the Promo structure this year was 1 card that lined up with the Season they were working on, and one card that's useful in game situations. Many times, they picked one of the best cards from each Character as their Pokemon. What I'm thinking for this season is that they'll use the GS Gym Leaders, and have their cards broken down like this...
Faulkner: Fearow UL-15 or Noctowl HS-8***
Bugsy: Scizor SF-25*** or Scizor MD-29 or Butterfree HS-16 or Beedrill RR-15 or Beedrill UL-12
Whitney: Miltank SF-44*** or Miltank HS-47 (I doubt they'll use Clefable here)
Morty: Gengar AR-16*** or AR-17 or SF-18
Jasmine: Steelix SF-28*** or UL-24
Chuck: Poliwrath UL-21 or LA-35***
Pryce: Dewgong SV-24 or Mamoswine LA-9 or SF-21***
Clair: Dragonite LA-2 or Kingdra LA-7*** or UL-17
*** - Indicates what I think will be the card they choose.
Now, for the cards that I think need to be in here. They'll choose something playable but not LvX rarity. They had the chance to do that with Dialga and didn't. I think the bulk here will be Power Pokes and Trainers. Here's a short list of what I'd like to see here...
Uxie LA
Azelf LA
Collector
Communicator
Luxury Ball*
Bebe's Search
Palmer*
DCE
Judge or Giratina Let Loose*
Rare Candy* (always and forever)
Call Energy*
Spiritomb*
Sableye*
Expert Belt*
I've *'d the ones I think will be in there. Remember, they either can't or won't use cards from the newest sets for their Promos, so throw out virtually anything from the HS sets. I also doubt they'll use the same promos they did last year, as it'd kinda feel like a cop-out for the non-competitive players. There are 8 incredibly useful cards I outlined above that I think will be in the next set.
Of course, speculation is not confirmation. I'll wait until they actually make an announcement before judging next season.