I'm surprised there is no manufacturer listed! Every prescription we get has one listed on the label. I assumed that was to be able to track in case of recalls.
Anyway, it looks like there is a third generic on the market now. Watson generic is actually just brand-name Concerta relabeled, which is the 'Alza 27' you had before. Mallinckrodt was the next one to come out and those are the pictures that were in the link. Kudco now has approval (as of July), so likely that is the one you are getting. The ANDA hasn't been posted on the FDA website so they don't even have a description available.
As far as I can tell only Watson is using the osmotic release system because they are actually the exact same as brand-name. The other two are just extended release of some variety. I'm actually surprised they were able to show bioequivalence with a different system.
Mama to three boys ('03, '05, '07)