Update:
Alex updates this story with this note:

I saw the new pic of the Good General from an "unknown source". It's actually a cover of the UK Star Wars magazine. All the articles on the front page match what we've been promised for this months issue. It was supposed to come out on the 17th June but I've not seen it yet (and I suscribe).

And Gary forwards us this email, too:

I've just taken a look at the cover featuring General Grievous and it looks like it will be the cover to our next issue of Star Wars Magazine here in the UK. We get the Insider articles months after they have been printed in the US, so that could be the reason why these stories appear old to Insider readers. Anyway, hope that helps!

Update 2:
Cartman1000 adds:

The image of grievous on the cover is actually a poster, which is in the middle of the magazine. I've a attached a scan of that (above right image), although it is too big to fit on my scanner so there is a few lines and a creace in the middle.