Just throwing this out there after reading through the thread a bit.
The last piece of the previous Kickstarter was the Player's Guide, and it has been mentioned that post the 5.1 release that is probably next on the schedule. While later even by KS standards, I do applaud waiting for the revision of rules (and hopefully this time things were more carefully edited) so that the players handbook can be better.
On the perpetual updating: that always depends on the author. The general rule appears, from my experience in DriveThru, corrections and updates get posted to your library. New versions is where things get blurry, and whether or not 5.09 vs 5.10 is a new version vs. updates/corrections is debatable. While my preference would be to update the library with the "corrected" version (and that is a very loaded word in this context!), I feel that it would be a good thing to do but not necessarily a required thing to do.
And finally - I too am looking forward to the next iteration, and hope that it becomes an actual playable system. While I really love the BBB, and enjoy going through it, the lack of index and its, err, interesting, organization makes its a voyage of new discoveries every time I do open it.
And yes, I will pay for yet another version to have that. As I've previously noted, I am sadly addicted to both Kickstarter and Traveller, and when they coincide, there is about a 0% probability I can NOT do it (even did the Mongoose JTAS and I have all the originals...I believe I need to join Kickstarter Anonymous as well as Traveller Hoarders Anonymous!)