Do a little leg work and call them. It's impossible to keep up.
Went into the Apple store in town at lunch today. Absolutely no sign of new Mac Minis.... all the old one's still on-sale. Store manager said "next few days".
(For our relatives over the pond , it's 20:40 here in the evening, and the Apple website got the Mac Mini and iPhone 4 at 09:00 this morning).