You probably don't know what the Official Nintendo Magazine is, unless you live in the UK. Whether you know them or not, they've previewed the two upcoming Pokémon games. They've done it slightly different from their other previews, since they've done a 'Top Ten', instead of a general run-down. See the attachments for the scans.
The magazine's website is: www.officialnintendomagazine.co.uk - Proof that it's official for you non-believers!

You may have to click the enlarged pictures again, and then zoom in on them to see them properly. Sorry for the quality, and sorry the edges of the pages are cut out!

2 attached images

I really think this is a joke for three reasons, a celebi is following Gold, (What did they take the pictures from Serebii) mostly everything is just a joke, and the in-game text is in Japanese.

Looks pretty official to me.

Great review.
Thanks for sharing.

Thanks for viewing them. Can you tell us the website?

EDIT: I just checked. It is official.