I'm a bit concerned that if they've awarded all of them to the same company, that each service centre will have exactly the same food.
HMS Host is the main highway service centre provider. I was at a HMS Host-operated service plaza on the NJ Turnpike, and it was a choice of Starbucks Coffee, Burger King or TCBY, and most were the same. The prices were higher than off-highway locations too.
The NYS Turnpike has a rotating selection of fast-food joints, but I found the Illinois "Oases" to have the best selection, mainly because they serve both sides of the highway in one centre, either with ramps carrying traffic to the other side, or a oasis in the middle of the highway with ramps and fuel on either side.
I don't mind the Ontario choices - typcially Tim Hortons and McDonalds or Wendys and/or Subway- but there needs to be two food choices. There were some that were only McDonald's, and one towards Cornwall that was KFC only.
Basically, a service centre should have
1. Tim Hortons (or a Starbucks) - TH should be 24 Hours
2. Wendy's or McDonald's
3. Mr. Sub or Subway or other food provider
4. A convenience store (and after hours vending machines)
5. Clean and effecient washrooms
6. A fuel station with fair prices.