Unusually, I received a paperback copy as well as the hardback. Generally, paperbacks follows 6 months to 1 year behind, but Macmillan have decided to publish both together. The thinking is that, people who prefer hardbacks will still buy them, but those who would otherwise wait for the paperback, possibly losing interest in the meantime, will now not have to wait at all.
This works rather well for me too: I get all excited about my newest books and want to promote them and read them in schools, but the kids can't afford to buy hardbacks (and they're too heavy for me to carry to schools anyway).
As with Gnash, Gnaw, Dinosaur! , this one has big flaps on all the pages, so the two illustrations above are the Elasmosaurus, before and after the flap opening.
I believe publication is in March: I'll be letting you know later, so you can all rush out and buy copies for everyone you know... Oh, go on...