| | My findings so far...
The T-Mobile My Account app does not work with this build.
However, Shazam does work on this build.
Could not locate the Blackberry App world icon after installing the OS, even though the app showed up in the "Add-On" application list. Had to download again to get the icon to appear.
Font size of 3G/EDGE/UMA is now the same on the home screen and app screen.
Have ~15-20MB more application space on this build!! Had 132MB free after install before loading apps.
Scrolling through my pictures folder freezes the phone for a couple seconds after almost every swipe of the trackpad. Takes a lot longer for the thumbnail images to render on screen than the previous build I used. Scrolling through the pictures folder on build .586 was flawless. This version behaves like most of the early 5.0 builds - when it comes to viewing your pictures.
That's all I have to report for now.