Booked VS flights in PE as Delta Codeshare, Now UC?

Flying 18 April-12 May.
Several months ago, I booked paid PE on VS8 and VS141 through Delta website as codeshare. Paid PE, fare class was W. Looking at the reservation now on both Delta and Virgin websites, the fare class is A - First Class on Delta, Upper Class on VS.
I can't imagine I've gotten a free upgrade to UC.
My guess is there is a Delta system issue, and if I select seats in UC now I will get moved back to PE at some point before the actual flights.
Any info or insights are greatly appreciated.

Seems to be affecting quite a few people. There's a thread about it here:

viewtopic.php?f=4&t=295290

Virgin don't use 'A' class so it could be some weirdness on Delta's end.

Edit: Just found an explanation on Flyertalk:

Right now DL is under going a fare class realignment in preparation for selling PE on its flights. A right now on DL is First Class. However with the changes A has become PE. This just changed this weekend. Thus what you're being told is Business/First is actually just PE.

Thank you so much for the reply.

If you are brazen like me... select UC seats and see if it boots you out later :P

I was thinking of that CommanderB....has it worked out for you in the past?

people on the DL board on flyer talk are reporting that whilst the seat map will let them select a seat in UC the selection is not sticking.

Don't get your hopes up that you've been upgraded.

Both DL and VS are aware of this problem and have tols other passengers that it will be fixed in 7-10 days. But we've had that before.