Wonder if OS 3.1.4 will use AROS code for a certain component, like OS 3.9 does 
The code in question was the v44 colorwheel gadget. It was actually developed for 3.5 and
then donated to AROS aswell. Nothing to see here.
Yes, SAGE was my first idea (the SAGE II and SAGE IV models), but I know next to nothing about the roles these machines played during development of the Amiga operating system precursor.
According to Bagnalls "The Amiga Years", Amiga started assembling a software team in August 83 and had bought a bunch of SAGE IV machines for them to use. I'm assuming these were only used as terminals though, because Mical is quoted in the book that later on (when Commodore bought Amiga), each Software Engineer got "his own powerful SUN workstation, with his own harddisk and CPU".