Given that the tunnels require significant upgrade work, and are substandard to today's highway design standards, AND the precedent set for the "Port Mann Twinning" that was not to be, I expect any H-99 project to include a fully rebuilt 8-lane (expandable to 10) crossing.
A newly rebuilt interchange at Stevenston Highway, will have dedicated lanes to go over the bridge (like Surrey-Coquitlam). The existing Hwy 17 interchange will be scrapped, in favour of the new SFPR - 99 interchange, which will be the start of northbound dedicated "local lanes"
So, you'd have a 2-3-3-2 configuration from the SFPR to Steveston.
6-laning along the 99 to both ends of the 91.
I like the idea of a crossing at Boundary for many reasons, including direct access to the business park in South Burnaby, pressure-relief on the Queensborough bridge, and potential routing north along Boundary Road.
I'm sure Vancouver and Burnaby would stir up a real $@#@ fest over that one, but it makes sense from a planning point of view.
Since we're looking at a 2030 opening day, the toll will be $20.00 per car.