So, I'm only mildly disgruntled that there wasn't a big reveal of XY proportions, but most of that feeling comes from utter confusion as to why it looks like they have NO MARKETING BUDGET for these games. There was no narration, virtually no gameplay shown, and the first spot ad was only 30 seconds. Plus, I know that we already have an idea of which Pokémon are going to be in-game, so there's no reason to make a big fuss out of the starters, but that doesn't mean we have to be denied seeing just a little bit of the overworld.
To be fair, though, main series Pokémon games don't really need that much marketing. The Internet makes a lot bigger buzz than any marketing department ever could.
On the other hand, I can see where you're coming from. There has been revealed consiciously little about the games so far. Of course, this makes the Internet buzz even higher, but still...
I guess they are going to let the Internet buzz for a while before gradually dropping footage and more info. We know the region already, we know there won't be any more Pokémon species we don't know about already, and we shouldn't expect any surprises in terms of story either. There are a
lot fewer unanswered questions here than there were for X/Y. In that sense, GameFreak has a lot less to show us than they had for X/Y as well. A Mega Evolution or two, perhaps a Forme, or some in-game footage, but that's all they have to offer before release.
This either means longer waiting between info dumps (and remember how little we heard after Sylveon's annoucement - it took
almost three months before more info was revealed after that), less info per dump, or spoiling the entire game before release. It seems like they have gone for the second option - acknowledging our curiosity, impatience and thirst for information, but portioning out said information very carefully, lest we all gulp it down in one go.
Now in the first couple of weeks after the announcement, we'll have no more fun than we make ourselves. A significant portion of the fan base know Hoenn inside out already, so a lot of conversation can be had over nostalgia and wishlisting (not that all Pokémon communities
approve of this, of course, but that's our own choice). Then, we can expect a somewhat major annoucement after a few weeks. Mostly artwork, new characters, in-game footage and a little "what's new" blurb. Maybe even a couple hints as to what the deal is with Groudon and Kyogre. All in all, an amount of information comparable to the X/Y announcement trailer. Once we've got something concrete to talk about, things will probably be as quiet as they were after Sylveon was announced. Remember, between the X/Y announcement trailer and the next major info dump, it took
126 days, during which all we got was Sylveon and Mega Mewtwo Y (and for both we were only shown the models and a couple of moves). Then, I guess we'll see more info as release nears, starting with a couple of Mega Evolutions (my guess: Metagross and Salamence, as version exclusives [though this will not necessarily be stated at first]), then the region map, then info on whatever new facilities they've added to Hoenn, a couple more Mega Evolutions, and then the games will be released.