I think you guys should do an 8th tournament at Adepticon. However, why are you guys so inclined to have these huge updates? They will be confusing and a deterrent. I want to play 8th edition, not 8.5!
I'm not in your region but would like to suggest to just use logic.
A compiled FAQ/errata 1 download would be very helpful to run an 8th edition. Just so players can get the rules without having to hunt for them on the internet.
Any comp pack should be a separate package\download. Because seriously when you change even 1 thing it can drastically affect strategy and list building.
As for beastmen and brets. ....well if no one signs up to play with either of these armies then obviously its needs some help. But you don't go crazy with it. You just adjust the point values and leave the basic rules the same.
I think the goal should be to have: updated army rulebooks for ALL races that need them (long term more than for Adepticon 2016), with an emphasis on the more mainstream and direly needed ones first (looking at Bretonnians in particular), and having perhaps an Erratta sheet for "8.1" for lack of a better term: a set of fan-accepted rule tweaks and revisions solely for balance, with an emphasis on changing as little as possible to both keep 8th feeling like 8th and making it easier for players to adopt overall. A one or two page handout that we all agree covers vital balancing issues is easier to get other players on board with than a fully revised rulebook they'll have to pore over.
By extension, that'll make it easier for players who aren't part of this forum to both give their thoughts and feedback on the changes (since it won't take as long to look over), try them in battles (since it's easy to understand them and convince people to try and few "house rules" instead of a whole new revised book), and in general win people over to the concept.
I want 8th tweaked and improved now that GW has decided not to bother, but I definitely want to preserve as much of existing 8th as possible in doing so, both for ease of growing the community, getting our work mainstream acceptance amongst the player base, and because we're here because we love 8th, not because we're developing a new game altogether.