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It has been common for step releases to just happen on a random Tuesday. If there were a new case design or radical change it would have been part of an event.

Here's one they did for laptops:

http://appleinsider.com/articles/10/04/13/apple_releases_new...

And one for iMacs:

http://appleinsider.com/articles/10/07/27/apple_updates_imac...

That's quite a selective "Back in Steve's day" memory. A lot of spec bumps like this one for Macs and Macbooks happened exactly through press releases like these.

>> That's quite a selective "Back in Steve's day" memory.

Is there any other kind?

A lot of the old announcements were due to "we finally squeezed a few more MHz out of the G4/G5, thank god." variety.

"Back in Steve's day" they frequently updated all kinds of Macs with no announcement whatsoever, if it was an incremental update and not a redesign.