For me the differences are quite subtle, you'll notice(compared to its 26" counterpart) that its easier to maintain speed and that small bumps will simply roll under the tyres. They also 'bridge' trail obstacles that a 26er will hook up on and you'll be able to tackle technical sections easier, again the big wheel neutralises alot that would trouble a 26er. The larger tyre carcass will give slightly better comfort and a very noticable increase in grip. The geometery has came on where you don't feel so much on the bike but more in the bike and has been refined for riders of any height and there are a few variances for ride style.
Its not all rosey though, there is a slight slowing whilst turning though chainstays are getting smaller to combat this and they are not natrual in the air, I certainly don't like flying drop offs. Again geometry is helping this if you so wish. Also part availablilty over here isn't great. Also theres much talk of acceleration beiong slow because of the big wheels, if this is something that would bother you its wise to spend well here and research it too. If you read the mtbr forums though there is a move stateside to go with big wide rims and fat tyres, bugger the weight and enjoy the ride
What kinda of riding do you see yourself doing with it?