It's always kind of cool when Microsoft updates that back-end of Bing Maps because you don't need to, you know, do anything. Sure, it's not better voice-navigation nor Ovi Maps, but the changes are not exactly subtle either. Instead, what we have in the mobile version of Bing Maps more closely matching the desktop version.
Most of the changes deal with the color scheme of roads, with purple denoting major highways, blue secondary roads and grey for back roads. Text looks a bit easier to read and perhaps its just us, but the app seems to handle downloading and caching maps a lot easier, resulting in faster scrolling. Other than that, we're not noticing too much else but we're betting this may be a regional thing too.
Shout out in comments if you noticing anything and we'll add it.