ToyFair pics are out on various forums and image hosting sites, and the Ice Mammoth coming out in July/August definitely looks like a nice set, albeit one that could make use of heavy modifications to complete a somewhat lackluster rear end, as well as fleshing out the overall shape of a mammoth. The dual features included in many of the upcoming summer sets are well executed, and it's nice to see Lego making well designed sets that also have various play features that look to function well. The Chima line as a whole is vibrant, and if I were not a Star Wars fan I would probably collect this line of sets for the coloured bricks and fantastic minifigs (and larger figs, such as the elephant/mammoth fig in one of the sets).
The winter sets, with the new small ball joints also seen in the Mixels line are also great, adding a new dimension to the Chima Line, which now includes playsets, vehicles, minigifures, constraction sets and system/small scale constration beasts. Add to the fact that it's a Lego original line and it's even better