Just to get this out of the way, when it comes to pre-release content taken from an official source, those are good to go. Like cover art, announcements, etc. The obvious
One thing that might become worthy of notice is the occasional tendency of adding things based on leaks of chapters. And while leaks can provide some information, it is important to remember they are not the complete chapter. My point is to simply inforce waiting for the official release.
This can cause several issues, many of them being related to potentionally false information. Not only does this add confusion to a few users, it also fuels a bit of speculation. A complete chapter offers complete context, and as such it would be preferable to wait for the official release.
One recent example is the confusion over wether or not a certain name is one of the character or the Stand. Many of these are mostly related to the potentional of adding false information. And while the information could come across as "obvious" and rectfied in a couple of days, it is simply not worth the risk.