Great post! I bet you are going to be saying this 1gig more times over the next year lol.
I spoke to John and Ed from Orbx in person for a good while at Flight Sim Con 2017 last Saturday. If its in your FTX Central application then its ready for V4 and you can install it....its made for V4. Airports are coming soon BUT not until they are ready.
That's a very nice thing they have done with FTX Central. I wish more scenery makers would go that way - 1 click install for everything you own.
Quality Wings is developing their new B787 for V4 and the FS packages guys wont make installers until their stuff is ready for V4. I have installed about 40 airports from Flightbeam, FSDT, Flytampa and a few others that were said to be ready and they work just fine. Keep in mind that V4 graphics options have been extended/expanded...running everything to the right is going to slow even the best machine. Its all about finding the right mix for your computer. You'll see scenery makers optimizing textures as they learn.
Like Rob said, aircraft are another animal and they must be compiled for 64 bit or they just wont work right. The makers that seem to kick out airplanes every other week are likely to do just enough to get it in V4 for now and maybe truly adapt it later on. But those are the airplanes that are no where near what we have come to expect from PMDG - they were/are "budget" addons from the start. Trying to be nice there.
I got a chance to talk to Rob McCarthy, lead programmer for P3D V4. He said there is a whole set of new tools in the SDK for V4 the dev community has to work with. As they learn and see what they can do with those tools we'll see some amazing stuff. Also, after talking with him its clear they support our addon devs to the fullest. I confirmed this with every dev I talked with - they all say LM is the best sim developer they have ever worked with for support.
I'm not too worried about the addon guys not doing the right thing. They all want to see what this new animal can do. I think same as aircraft, scenery will makers will mirror what we see now in quality and compatibility. Crap scenery makers will be crap in V4 while the big guys will do their best optimize for V4 so they can sell me more pretty shi....stuff.
Doing a reality check, V4 hasn't been out a month and look whats there already. This was not like this when FSX released...not even close.