So, firstly a new exhibition in Paris at the Musée Maillol:
Pompéi – un art de vivre. 21 (Septembre 2011– 12. Février 2012)
There's a press pack here with some interesting information about the exhibition.
Secondly, the A Day in Pompeii exhibition opens in Boston on 2nd December (this is the one recently in New York, and before that in Singapore, New Zealand and Australia).You can see some previews of the exhibition on YouTube. This one is my favourite, it's very cool.
Next, there's to be a new exhibition at the State Museum of Prehistory at Halle, Germany:
Pompeji, Nola, Herculaneum (9 December 2011 - 8 June 2012)
I like this poster a lot, and I also like that Nola is included.