Lodi had their one-year run and quit. They got replaced by a Yuba City team sharing the same ballpark with Marysville, and that failed (though the remaining team is now coined the Yuba-Sutter Gold Sox).
Chico is Chico. Medford, who for some reason left the demonstrably better West Coast League, also remains (geography? maybe?).
A Sacramento team that wanted to renovate an old park in town was an all-road team in 2016 and apparently gave up the ghost in favor of a team in the formerly very small town / now distant Sacramento suburb of Lincoln; still a going concern.
In place of that Lodi/Yuba City team... San Francisco Seals, who will be playing out of College of Alameda (East Bay), and is an interesting extension of a fairly large youth travel baseball operation.
Portland had a better two-year run than I envisioned... to the point where they're joining the WCL this year. Replacing them is Klamath Falls, making a far better travel partner for Medford, but also a WCL reject.