I found this one on Celebrity's shore-ex listings, but I can't find any info besides what's there. Depending on the vendor and particular boat they're using, it could be an interesting tour. As I mentioned, it's definately a new tour that I don't think you'll find any past reviews for.
Maybe Budget Queen or Karen can dig up something from the East Coast that I can't find sitting here in Juneau. She always seems to have those helpful tidbits of information that us locals don't even have.