Hi TimeZone750,
As far as I know, there are no new changes that the new 1.1.3 firmware for Second Gen Nanos has added.
For example, I believe it was the 1.2 firmware for First Generation Nanos added support for the Nike + Sport kit.
That's not the kind of thing that the 1.1.3 firmware does, since it is simply for those unnamed "bug fixes".
Usually, if you have a second digit firmware update (for example, "1.
2"), there is a bigger change than just bug fixes. Compatibility to some sort of thing, like games from the iTunes Store with Fifth Generation iPods, can be added with this kind of update.
If you have a third digit firmware update (for example, "1.1.
3"), it's typically just for fixing stability issues, and doesn't really add anything new.
For me, all of the firmware updates for my Nanos didn't seem to really change their behavior in a good or bad way.
Recently, however, I'm not sure if the 1.1.3 update directly related to this, but after updating Natalie, I noticed that she had a problem where, when "Now Playing", every song on the full-sized album art screen had the same artwork as one song.
It wasn't a really annoying issue, since the album artwork was displayed correctly on other screens like the main Now Playing details of Artist, Album, and Song.
After attempting things such as resets, resyncs, etc., a simple restore fixed the issue.
Still, it's really quite unlikely that you'll run into an issue that the 1.1.3 firmware introduces that some of the general troubleshooting procedures don't fix. (Like a restore, for example).
-Kylene