Yes, this could mean anything. It could mean Gen 6 (which I would quite like), it could mean R/S/E remakes (which I would also quite like, but for some reason can't see happening), it could mean new side game.
It could also mean a change in graphics, game mechanics, anything!
There are lots of things which point to it being Gen 6, and we can speculate, but we shouldn't get our hopes up - we know what GameFreak are like for tricking many of us into believing a new Pokemon, form, game, or something like that is being released. We shouldn't just shoot down what people think and speculate; we don't know what is going on behind the scenes at GameFreak. But we shouldn't go full-on believing it is something like Gen 6 before we get a definite sign. It is generic, but, you know, I'm just going to go with it.