The new brand is the 'hemisphere'
http://www.priestmangoode.com/projec...-cabin-lounge/
"Forward wall featuring United’s new ‘hemisphere’ signature pattern, alongside the new United Polaris brand identity."
Instead of a big bang, everything is evolving toward that. Which is basically no more gold or grey and addition of more subtle globe cues.
At some point the livery will probably refresh without the gold and grey, but that's a ways off.
Think of the way Delta evolved the widget.