Gmail on the BlackBerry is really nothing new. And offering yet another software app, again, just not that compelling. So I can only conclude that the Gmail plugin being discussed here is one that works directly with the BlackBerry email app itself.
In short, if I am following this correctly, it would mean having true Gmail functionality over your Gmail accounts without needing to install some extra program that is not even providing worthwhile integration. Because anything less, is a waste of time.
BlackBerry does a lot of things right. One of them is how the mobile device delivers email and calendar alerts. So if I am right and the above link is indeed, speaking of providing a plugin that allows users to mark email as spam, move email into different conversation and so on, then this is indeed a pretty big deal.