I'm actually not so sure. If the WBH is going to be a version of what T5 plans to use, then it still has some serious flaws.
If they get serious and involve some space scientist and planetologists, then it could be very good. (Yes, I am volunteering to help...)
GURPS: Space has a very good section on world/system building and with only a little effort could be ported over to Traveller.
I HOPE they do a better job than the CT book Scouts did, but if what I saw on a premilinary version of T5 world building stays true, then it will be more of the same.
Heres hoping though...