I'm a fully paid up Intense fanboi so there's minimal chance of me offering an objective opinion here...
The Carbine looks like a winner. Don't care what anyone says, 140mm travel is shitloads for a 29er. A Tracer 29 firmly occupies a spot in my dream garage but the combination of carbon frame stiffness and weight reduction will undoubtedly make an already brilliant platform even better. Plus it looks awesome. Tick.
BUT, I'd still take a Tracer 29 over one, for three reasons:
1) The idea of smearing a carbon bike into an over-enthusiastically approached rock garden (the type of garden that these types of bikes always goad you into thinking you can tackle) is not appealing. Alloy is a much cheaper alternative for this kind of thing.
2) The Tracer is made in the USA. Call me a luddite, but a big part of the appeal of Intense is that they're not punched out in mass quantities by Merida (or whoever). The idea that my bike was lovingly assembled by a bearded fat bloke in a Californian shed over being precision welded by robot overlords in a state-of-the-art factory in Taiwan is very appealing.
3) The Carbine 29 is not offered in an XL. Why. WHY. I've ranted about this at length before, but I just don't understand why you wouldn't design a bike around a platform (29er) that seems almost tailor made for big bastards (particularly with its longer chainstays) and then not make an XL mould. And I'm not buying that economies of scale crap either. Santa Cruz managed to sell shedloads of Tallboys on a limited size availability (M,L,XL) for years.
End thought bubble.