Oh frick, GW are really a bunch of.... <removed>.
If memory serves me right BFG2.0 was in process before the latest rulebook. The latest rulebook took on the mayor wishes like Nova Cannon and Ordnance limits (yay all). Some point changes (eg Styx, Emperor-Retribution) players asked for and point + profile (!) changes no one asked for (Orks) (Blame Andy C himself I think).
Many wondered if it was the new 2.0 but if memory serves it was Bob who called it 1.5*.
That 1.5 rulebook is a bad book. Look at the Nova Cannon: rules with scatter, diagram with guess. Point swaps not in all places. Rules forgotten: Repulsive shield. Rules forgotten and only recently Ray found out (the asteroid field rules on AAF). Some other things.
The book was a bad decision in hindsight.
* If the current book is 1.5 then the FAQ2010 makes it more or less 1.75.
What I find is odd why GW is so secure on the rules not being shown/used. I mean, back then it costed them money, now they could just make em free. Have a freelance HA and fans chew and work on it. Do all the work for them and only host the pdf's without makings costs to create a bound book.
Also Nate, you did not give anything away so your NDA remains safe. You just confirmed what many already thought to believe.

Although some changes you hinted are are extremely worrying

But I approve of the HA's approach.
I don't know who is the guidance setter is for BFG from the GW team but Jervis has allowed the Epic: Armageddon team to do a lot of work and changes to the core rules.
I would find it cool if the GW responsible would show up and explain why changes are not allowed. Okay, given, as long as the blue book is being produced/sold changes are indeed off limtis.