PMDG has released 777, will there ben an update to gsx ?
Well, after GSX got an user-configurable airplane editor, the concept of having to wait for a GSX update to support any airplane is no longer relevant, because either the airplane developer himself might release GSX files together with the installer, or any other fellow user could create such config, and of course you can do it too.
So, unless there's something really specific to the PMDG 777 that would make it not compatible with it (which we still haven't heard of, but it's too early), GSX doesn't need to be updated to support it, you only need that someone, either you, PMDG or a fellow user (or even us, of course) would create a config file for it and share it, maybe in the sharing area on this forum.
Of course, if there IS something that makes the PMDG 777 not compatible with the current GSX version, we'll obviously update it.
Just like when Majestic released their excellent Q400, which required several changes in GSX (and in the airplane too), due to the fact they used an external flight model.