I originally had a name for this planet, but I took it out. I did indeed look at the galaxies in the AllSpark Almanac II, but damn if I wasn't overwhelmed despite the number of research I did on which reference it was making.
So it's just nameless planet. It looks fairly organic so I can say it is either a foreign alien planet the Autobots at least have some alliance with OR it's an empty organic planet in the process of turning more metallic and mechanic to suit the Autobots needs and make it part of their commonwealth.
Some of the robots you see are made up, the rest are canon characters seen either in Season 3 cameos or extras in the AllSpark Almanac II.
God, I want the first AllSpark Almanac SO BADLY!