I just transferred all my item to the new version of shop; am I supposed to delete my old shop now?

I guess you could if you wanted to, but you could also just leave it alone and wait until the feature is fully implemented across the site. Everyone will still have access to their old shops, we just won't be able to add any new items to them.

If you were working on the achievements for having a shop that has earned a certain amount of sP, it might be a good idea to keep your old shop until they figure out what they're going to do for those people. It might be good to have some sort of proof to how far along you were, other than just the achievement tier number.

Thank you!