Any update on this since the release date have been revealed, (Aug 18th)
I'm not sure what you are asking here. This post, and my answer, are dated July 16th, that is 3 days AFTER the August 18th release date for MSFS has been announced so, are you asking for ANOTHER update on our part ? Not much has changed in 4 days, with a weekend in between...
and a timeline for the airports too please.
We don't have any timeline, we haven't even decided which airports will be released, because this will depend on the users reaction to the sim, and how satisfied users will be with the enhanced airports.
And yes, as I've said already ( which has been confirmed by other scenery developers as well ), the SDK is far from being complete, and there are lot of things that make an SDK, some more relevant to airplane developers, some more relevant to scenery developers, some to tools developers, and they won't all come at the same time and not on release day, it's very likely both the sim and the SDK will be a constant work in progress, for a very long time.