Yes, I am also finding 6730 TX's to be a little longer than the average for other freqs. The freq itself has been know for a few months.
The music is probably used to ID the recipient, so it is likely to be different from other music you have heard.
Note that the YL voice also announces who the recipient is, you can track the music to specific recipients.
I would say it is not a new one (just my opinion), as it happens to fit into holes in the schedule and it does not seem like many of the old TX's have been removed to account for the new TX's. I always suspected that there had to be other freqs based on those holes. If they simply needed to support more recipients now they had plenty of room on the old freqs. Remember that there has never been reported any "double" V24 TX's, in other words never two on different freqs at the same time.