We keep the above link updated with all our firmware progress.
We're currently working on the XR500 and the XR700. Once those bugs are resolved and released we're hoping to treat the XR300 as a new platform and essentially port to it again. It's a big job and we don't know for sure if it's going to work given the age of the hardware but we're going to do everything in our power to make it happen.
Given the age of the hardware? Netgear should sack you monkeys as developers because its the age of your promise that led me to buy the product to begin with. I was expecting regular updates and features as sold by the Netduma team years ago!
