The ICC has published a new specification for color profiles called "iccMAX." It's been published by the ISO and is formal.
http://color.org/iccmax/profiles/index.xalter (http://color.org/iccmax/profiles/index.xalter)
At first glance at the XML, it looks fairly trivial to support...? It may actually already be covered by ET's ICC parsing, but I am unsure.
- J
I've confirmed that the v5 ICC profile format (aka "iccMAX") has a good number of unknown tags and in fact is rejected by ExifTool in many cases as not being a valid file format.
- J