Correct me if I'm wrong, but on Bruce's upcoming album, besides a collaboration with his son on one song, there will also be a guest appearance by Andreas Kisser - perhaps even Derrick Green as well.
Personally, I'm not particularly drawn to collaborations for their own sake. They can make an album feel more like an all-star jam session than a cohesive artistic statement.
That said, I fully acknowledge that the song should be judged only after we've actually heard it. At this point, I'm simply expressing my personal preferences - or perhaps my own prejudices. Maybe it'll turn out to be great. Maybe it'll be a little too left-field for my taste. We'll see.
Edit: After posting this, I remembered Avantasia's debut album, which is a full-blown collaboration album - and one that I really like.
So I guess the problem isn't collaborations per se. The songs simply have to be great, and the musicians involved need to complement each other. It's about having the right people, at the right time, in the right place.