Seems like there is another procedural space game in development, "Dual Universe" by the french company Novaquark.
They've chosen a sandbox MMO setting, so something that Infinity: TQFE could have been.
As expected they're procedurally generating the planets, and promise seamless movement through the universe and planets.
Screenshots and concepts look interesting. One thing I personally noticed is that the planets shown in the screenshots look partially too small compared to the surface (hills height). And a video is still missing unfortunately that shows e.g. the transition between space and planet. Anyhow I think it could be interesting to where this develops. They've switched from Unreal Engine 4 to Unigine 2 lately (e.g. due to double precision).
From the FAQ:
What is Dual Universe?
Dual Universe is a gigantic multi-planet universe where players are free to invent their collective destiny: player-driven events will shape the course of History, civilizations will rise and fall, everything that happens matters in a persistent single-shard universe. We are pushing the limits of what is technically possible today to open the door to what we believe is the next generation of MMO games.
How big is the Dual Universe?
Thanks to procedural generation algorithms, there is no limit to the number of planets and star systems we can generate. As the game grows, so will the Universe, players will discover planets gradually as their spaceships take them further and further from the Arkships. So to answer the question: the Dual Universe is as big as far as you can travel.
Planets may range from a few hundred to thousands of kilometer in radius, so even exploring the surface of just one planet is a big task and would takle a long time to circumnavigate without the right equipment.