Nikon have released a firmware update for both the V1 and J1 cameras that fixes a minor issue with the flash overexposing.
Fuji have released firmware updates for both the X100 and the X10.
The X100 update aims to resolve an issue of the camera locking up under certain conditions and the X10 update attempts to reduce the problem of the infamous white disc issue.
X100 update can be found here
X10 update can be found here