Wow... go with the times, people
This was 2011...
Since then, Euclideon still has not released their "Unlimited Detail" engine.
However, they did strike some deals in the geodata space, with their software called "Geoverse"
https://www.youtube.com/watch?v=Irf-HJ4fBls
More on them:
Euclideon - Wikipedia, the free encyclopedia
Also, this is
a) NOT unlimited (if you believe that claim, I have some bridges to sell you)
b) Nothing new, really, see "voxels"
Sparse voxel octree - Wikipedia, the free encyclopedia, and point cloud
Point cloud - Wikipedia, the free encyclopedia
c) Littered with drawbacks - try doing reflections - have fun.
Not that their stuff is not fascinating.. especvially their indexing and real time access to point cloud data stored on a harddrive sounds very cool.
Unlimited? - no
Nicely fast? - Yes
Use in games? - depends very much on the game. Could be interesting, but I think the geospatial data visualisation (or other uses, such as MRI scans) are more along the real use cases.
::emp::