Here's what's currently planned -
(recall that the criss-cross switch replaces the PMC Line's basket weave)
Each platform has a designated destination.
Green - to Coquitlam
Red - to Vancouver
Blue - to New Westminster (and beyond)
This provides a cross-platform transfer from Coquitlam to New Westminster (i.e. Surrey), but an up-and-down transfer from New West to Coquitlam.
I think Deasine's suggestion would have the Coquitlam platform located between the red and green lines (?)
Here's the
PMC Line brochure (RTPO 2000) posted by SteelWheels a few years ago: