Even more than GT3, it would seem that settings in GT4 are going to be very specific to a particular driver in a certain car on a given track.
Someone else's set-up may very well be utterly useless to you and it will probably profit you in the long run to learn how to fettle up a cars suspension according to your own preferences.
It's harder work than just snaffling someone elses spannering efforts but much, much better in the end. To illustrate, in the past few years I never found any settings for GT3 vehicles that worked better for me than my own. That doesn't mean I'm some kind of engineering god, just that the best person to set a car up for me to drive is me .
To more directly answer your question, GTVault will be going GT4 at some point in the future but there is no specified deadline as yet.