They've updated the UI slightly (as you can tell by the weird lower quality/smaller font.)
The game for me is actually a lot smoother with less loading screens.
A LOT of people are complaining on Twitter and DMM wiki about loading/crashing issues. I believe the issue may be resolved in clearing cached files/cookies + site data after the update. If not, then there will probably be another emergency maintenance OR along with the maintenance on the 24th when Dummy-Kun comes.