Are you talking about the actual "native" app, or using a browser to access the mobile skin of the website?
The app isn't new or changed (or even made by EN World), and while using it is moderately improved, that really is incidental to the upgrade.
What do you like about the new site?
Nothing. The forum software sucks big time.
Sorry, should not have said "app", I meant the mobile web site. I found the old mobile site to be difficult to use.