But using a "secret" link, I just visited the page you usually got to and headed on to Upgrade My Library. And yes, there were a few albums available for upgrade that weren't there yesterday. Not many (compared to how many DRM tracks I've bought), but a handful, from various labels (including Universal, Motown and Geffen).
And from the time I wrote that to now (15 minutes?), Upgrade My Library has been emptied. Nothing there. Zero.
Anyone else seing something?