The white 10MP Ricoh GR DIGITAL IV camera is currently listed as discontinued at B&H (black version is still available): "This item has been discontinued by the manufacturer and is no longer available". The GR IV was announced on Sep 15, 2011, the GR III was announced on Jul 26, 2009. I am curious how Ricoh will develop to the GR line after they purchased Pentax.
Update: DigitalRev also lists the black Ricoh GR DIGITAL IV camera as discontinued: