Hello WBB,
I saw a video on YouTube where the GP 30's were introduced at the York show. The guy said that the sound system would be eventually offered as a separate sale item to "upgrade" the trueBlast 2 sound system now in locos. Please say it's so!!!
PS
for all who want to see the video, here is a link:
http://www.youtube.com/watch?v=qr_mM6C3hrU