Coming in October, according to the press release as quoted at DPReview
Ricoh adds features with final GR Digital II firmware update: Digital Photography Review...The update, due in mid October, is the fifth feature-adding revision for the high-end model and includes several additional features that have come from its GXR and GRD IV cameras. These include the ability to assign an additional option to the 'Adj.' lever and the locking of the power button if the optional new GL-1 metal lens cap is fitted. The company says this will be the final update for the GRD III.