I read people are calling the Pangolin different names (11, 12) and that 13 is on its way. But where do I see that and what the version of the current one is (that they sell right now)?

Sources? Here it someone calling it Pang11:

https://ubuntuforums.org/showthread.php?t=2470719

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Here is someone calling it Pang12 and that 13 is almost out:

https://www.reddit.com/r/System76/comments/17owi9p/docking_station_pangolin_12/