Comment by sikhnerd

Notables from 4.2.0:

  * layouts
  * window groups
  * better mouse support
  * vertical split
  * new and expanded commands

Though I doubt this will entice me back from tmux, even though my primary motivator at the time (ages ago) was lack of vsplit in screen.

Also notable is if you upgrade you can't re-attach to sessions started by an older version of screen.