Hi Martin,
I'd recommend watching the video for BiaB 2013 video, it shows you the new features, and plays some of the RealTracks.

http://www.pgmusic.com/bbwin.demos.htm

Remember that there was a 2012.5 update as well, which had 101 RealTracks on it. So that's a total of 202 new RealTracks. It depends what style of music you are playing, but there are lots of great blues/rock/jazz/country players in the newest RealTracks.

As for the new features, here are the ones that I use the mos for BiaB 2013 (compared to BiaB 2012) :

Hi-Q MIDI sounds: The piano in particular is real nice and better than our existing sounds. Also nice strings (about 20 sounds total)

MIDI SuperTracks (like RealTracks, except for MIDI)... added in 2012. They are most effective for piano (when combined with the Hi-Q Piano sound), and work at any tempo/key, and you can edit them.

Horn Section RealTracks. We added 202 RealTracks since 2012, but the Horn RealTracks are something new, that work in Jazz, Blues and Rock tunes. Horns also work with other styles, like Bolero http://soundcloud.com/tobinthegull/band-in-a-box-bolero-with-r-b

Artist Performance Tracks: Mainly Jazz, also Celtic

Pick "best" soloist RealTracks: This new dialog shows you the best soloists that match the genre, tempo, feel of your song. The list is displayed from best to worst. For example, if you have a Jazz Ballad style loaded (tempo 60), the list will show jazz Soloists that will work well at a tempo of 60 at the top of the list, and something like a fast, Heavy Metal Guitar Soloist at the bottom of the list.

Favorite RealTracks, Favorite RealDrums list to quickly access your recently chosen RealTracks.


... all these features are demo'd on the video.
http://www.pgmusic.com/bbwin.demos.htm

Have Fun!
Peter Gannon
PG Music Inc.