Upgrades to the #NewGlenn rocket engines, as well as a 9x4 variant (instead of the current "7x2" 7 engine 1st stage, 2 engine 2nd stage).  #space 
<br /><a href='https://www.blueorigin.com/news/new-glenn-upgraded-engines-subcooled-components-drive-enhanced-performance'>https://www.blueorigin.com/news/new-glenn-upgraded-engines-subcooled-components-drive-enhanced-performance</a>