I mean, to be fair, this has been known for a reeaaaaally long time.
To those who followed it, sure. I wasn't following it at all -- something that big should be very clearly in the product description.
edit: let me clarify, in no way do I believe it's a bad game. I haven't played it enough to judge it but given that it's the same formula that they've been using for over 15 years I doubt it's bad. But when you advertise that this is the first Pokemon game on Nintendo 3DS, and show that "The world is in 3D now!" you tend to make the connection that, well, since there are actual 3D models and such now, it will support 3D. It's not exactly the most pleasing surprise that fans of the series would like to run in to, especially since it's on a system designed from the ground up to play games in 3D.