The most depressing thing about such situations is that instead of an announcement like "this game will be released here 4 months later on DD:MM:YYYY date" somewhere on the home page, we find out about it from some "accidentally spoken" gaming publications.
I wouldn't be surprised if that is not allowed (yet) by PlayStation Mobile. If the contracts are signed and they could mention the coming of the game to GOG they probablyt would.
I doubt that the publishers are the problem:
First of all, there is no such problem with competitors (Steam, EGS) - if a game is planned to be released in any of these stores, the information about it is almost always available and it is everywhere. And only with GOG suddenly
for some reason there is this problem.
Secondly, even if it were true, the problem in GOG is massive: it's not just one or two publishers, but many publishers, both first time working with GOG and publishers who have been publishing their games here for years. That is, one could believe that this is a whim of Sony specifically, if the problem were not constant and widespread here.
Thirdly, the problem concerns not only new games - here are published games and 20-30 years old, which have already been available on Steam for years. It sounds unconvincing that their publisher insists that there is no release announcement exactly on GOG.
All in all, I concede that it may be a condition of the publishers in some cases, but given how often (almost always) it happens here, I think it's about the store itself.
On the main page there is such a funny
(useless and always almost empty) tab - upcoming.
Is it really so useless because of the massive requirement of almost all publishers not to announce upcoming releases here or ... ?