Critical Space Launch System engine test fails
space.com
space.com
This piece on Ars Technica all but speculates that SLS will be cancelled. SLS gained political support from Republicans, and now that their influence is fading, I believe that it may ultimately be cancelled. https://arstechnica.com/science/2021/01/nasas-space-launch-s...
The first stage being fully reusable. With a major focus on quick turnaround, like 1 hour of post-flight inspection and refueling, then back in the launchpad again.
There was a slick Soviet design for a rocket system, that had 4 boosters with swept wings that glided back to base. I think the core stage also glided back to base.
Although this design might be obsolete, now that SpaceX has proven their suicide burns.