Do a forum search for "TRAPPIST-1" and you'll find lots of discussion about the place: demands that the system be included in the game, the coincidence of a procedurally-generated brown dwarf system in almost the exact same spot where TRAPPIST-1 should have been, and discussion from the beta forums and the update changelog noting the system had been added.
Yes, they added it with the 2.3 update. Must be some kind of record for speed-of-adding-IRL-space-info-to-the-game, and kudos to FD for doing it.
Yes, the TRAPPIST-1 system in-game has one Earth-like planet.
No, they didn't make the system inhabited, despite that fact that it's deep in the heart of inhabited space. That would probably have thrown out the BGS for any star system within a dozen LYs of TRAPPIST-1 and re-jigged all the Powerplay calculations for the region.
No, no-one has yet written any official lore to try to explain why a perfectly good Earth-like planet, first discovered in the 21st century and only a couple dozen LY away from Earth, has never been colonized in over a thousand years of interstellar travel. My favourite theories are:
- As the first-known "Earth-like planet", it was declared a perpetual Galactic Park, with all proposals to and attempts at colonization or development ruthlessly suppressed by the proto-Federation and its successor states. Of course, if this were true, it could really use a beacon of some kind warning off trespassers and/or a permit-lock on the system.
- Sentient or proto-sentient lifeforms was detected on the surface, thus causing the Federation to initiate a "Prime Directive" protection order on the system, declaring it system off-limits to human colonization. This scenario would likewise, ideally, need a beacon and/or a permit-lock.
- It was colonized but all previous colonization efforts have failed. Perhaps a particularly pernicious indigenous lifeform makes colonization dangerously unsustainable there, despite repeated efforts at eradicating it.
- It's Raxxla. It's been hiding in plain sight all this time.
