Sure, besides the number of contacts, the pins now move to the socket rather than the CPU, meaning there are no pins to break when handling a CPU. Instead there are “lands” on the CPU (basically little copper pads, and hence Land Grid Array) that interface with pins in the socket itself. The reason for the larger number of pins are pretty simple. First, for more power (obviously) and the second is for some 64 bit processing capabilities.
Technically, of course, that number of pins is overkill for a while. The Xeons get away with 604 pins …