Since many people here don't want spoilers, I'll try to be as vague as possible.
Until last Tuesday or so, I would have said no, but since they released news about a specific campaign and a specific boss character, I think they're giving us too much. As for both of these matters, I'm sure many long-term fans were already anticipating something like that anyway because we've had similar cases in previous games, but it would have been nice not to have it confirmed yet. Apart from that, we know what caused Chris's trauma, we know that someone who pretends to be a good guy is actually an antagonist, and we know that another person might have been cloned. Now, if they also reveal the circumstances of Jake's birth, what else will there be to find out by ourselves?
However, not knowing the game, I won't rush to judgement. There still is a possibility that it has a lot more secrets to offer. If that is the case, I wouldn't say they're spoiling us too much. The two guys who played the new demos at the game show last month mentioned several times that every one of the six main characters has their own reason to be in the game, and unless this is just a hollow promise, there might be six individual stories within the main plot, much more to expect than we know so far. It's still up to our imagination what Sherry has been doing during the last fifteen years, and we don't know anything about Piers yet. These are just examples of more story potential. (But to be honest: Knowing Capcom not only since yesterday, I think most of the characters' backgrounds will only be mentioned in the manual.)
