And here's the first physical item marking the beginning of the "Hard Candy" era - the promotional CD for Madonna's 4 Minutes distributed by Warner Mexico to the media starting this week.
The versions featured on the CD - which does not come with any sleeve - are the Album Version (4:04) and the Edit (3:10).

The disc also carries the production credits for the track:
Produced by Timbaland Production, Justin Timberlake for Tennmann Production and Danja for Danjahands Productions.
Additional production by Demacio "Demo" Castellon for Storm-Circle Ent.

Source: MadonnaTribe