Part of me actually wonders if the bridge is going to open up with 5 lanes eastbound and 2 lanes westbound.
The reason being, Highway 1 through Surrey is 90-95% complete, and can likely handle traffic coming from Coquitlam and Burnaby on those 5 new lanes.
Now, head westbound, over from Surrey/Langley, and there are parts of the Highway that are 30-40% complete. Keeping those 2 lanes into Burnaby would help reduce the traffic impact of suddenly funnelling 3 new lanes onto the existing infrastructure (which won't be finished until the bridge is opened).
And scrap that, those markings on the bridge deck look like they're meant for paving only. Take a look at a live shot: