I haven't seen, or looked for anything beyond the manual, but I've had a CableIQ since they first came out. Is there any specific feature you want to know more about?
I'd love to get a reliable way to get a Windows 8.1 machine to connect to and see the unit. Right now it's trial and error, eventually getting it to work. What I'd really like is an Android client that can download the data for later processing on a Windows machine, or better yet, and Android app that can also process the data and generate a PDF.