SpaceNews

NASA selects Centaur for new SLS upper stage

NASA has selected the Centaur upper stage currently used on United Launch Alliance’s Vulcan rocket for future flights of the Space Launch System.

Boeing’s Contribution to NASA’s Moon Program Just Took a Major Hit

A pending contractor switchup marks another blow to Boeing, which is struggling to prove itself as a reliable strategic partner to NASA.
ExtremeTech

NASA to Replace SLS Upper Stage With ULA's Vulcan Centaur for Future Artemis Missions

From Artemis IV onward, the new upper stage will be used instead of the existing interim cryogenic propulsion stage.
SpaceNews

Senate committee advances NASA authorization bill that changes Artemis and extends ISS

The Senate Commerce Committee advanced a revised NASA authorization bill that implements some changes to Artemis sought by the agency.
Morning Overview on MSN

NASA selects Vulcan Centaur 5 as a new SLS upper stage for Artemis missions

NASA has moved to replace the long-planned Exploration Upper Stage for its Space Launch System rocket with United Launch Alliance’s Vulcan Centaur 5 upper stage, a shift that could reshape the Artemis lunar program’s trajectory for years to come.
Ars Technica

NASA shakes up its Artemis program to speed up lunar return

I would have. SLS 1B and SLS 2 are not required for landing on the moon. Most of the cost of SLS has been development not production. Yes SLS Block 1 would be expensive and slow but no so expensive and slow it couldn't fly once a year maybe even twice a ...