I'm sure this used to be a theme for WordPress at one point? Either way, it's really unusual how Automattic haven't released it to the public
Yea - I see it as weird too. The only reason I'm still an advocate for WordPress are the self-host-ability/full customization aspects. Otherwise, you're just another Medium that's going to take my data and use it against me.
Honestly, I wouldn't touch this until Automattic publishes the code. To a old-timer who's been leveraging WP for well over a decade: ew.
This version is also a theme and will be released for self hosting in future too.
First there was actually the Prologue theme, then P2 was the second version (~2010?). Then O2 because “communication is oxygen for an organization”. Now back to P2 because that is the name that has stuck and everyone uses.
We (Automattic) use it as both a noun and a verb at this point. P2 or it didn’t happen.