Some cases just have a big opening for the volume buttons and mute switch, and should fit fine. But oddly, Apple’s own bumpers won’t fit — they have a very precise opening for the mute switch. I think that’s a good sign that this final design for the CDMA iPhone was completed after the GSM iPhone 4 shipped.
Update: 9 to 5 Mac reports:
[…] an Apple spokesperson told us that Apple will be slightly
updating their iPhone 4 case to support the Verizon version’s
new control placement too.
★ Tuesday, 11 January 2011