The other day when I was talking to my local store manager he was telling me about GW's new style of Army Book (I don't know if this will be for Fantasy and 40k or just Fantasy).
They're going to be hardback and fully colour printed. I don't know how/if this will change the cost but, still, sounds like they'll be really good.
He was also saying about how stunned he was at the detail and how well the new models looked, although annoyingly without giving any details to what there actually is. Something was said about a very nice brand new model which hasn't been in any of the O+G books before (along similar lines to the Skaven getting the Hell Pit Abomination).