In this weekend's update, WS has added its code on to DE's YVR/YYC/YEG/YYZ/YHZ-FRA services.
They also applied to the USDOT to allow DE to codeshare on select WS flights to the US effective June 27.
https://simpleflying.com/westjet-app...8-us-airports/
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To further the S25 schedule, I noticed that YVR-SNA appears to either be ending in late April, so simply moving to seasonal? Perhaps they'll utilize the slots on a daily YYC service instead? Either way, still way to early to tell for sure.