I think the likelihood of upgrading a mobile CPU is pretty slim. As far as I know, most (all?) notebook manufacturers don't even use sockets... the CPU is soldered directly to the motherboard, I think.
Even if you technically COULD upgrade it, it would most certainly void your warranty along with any support from Asus.
well afaik many laptop these days use sockets. i have teo socketed laptops, my hp thats now dead had a socket for its core2duo, blah blah blah-ive even seen one with a full socket 478 for desktop p4 cpus...but the heatsink was huge and it had 2 huge fans. so its likely that cpu has a socket too