According to mrmalty it is the same strain as White Lab's WLP920. No experience with either, but that is what the internet says.
They don't have the same PC releases every year. I actually just talked to the owner of my LHBS about a different PC yeast and he said what they often do is just release whichever 3 have been most requested recently. He said he talks to them fairly frequently and meets up with some of the Wyeast guys at the National Homebrew Conference every year and that's what they've said. If you want a certain PC yeast just email them a couple times and it might be part of the next PC release.
I looked a while back at their website and could not find a contact section or a place for retail customers to contact them.