I'm very skeptical about a mobile i7 coming out anytime soon. Quads are still new to the laptop arena and have terrible heat/power consumption issues as it is. I wouldn't be surprised if someone basically modified a non-mobile mobo into a laptop form factor and packed it full of heatpipes and high-rpm fans and sold a "mobile" i7 laptop, but... yeah. Take my thoughts in that arena with a grain of salt though, I don't work for Intel. I just remember hearing something similar for quads last year and how long it was until a true mobile part was released (at an outrageous cost).

But I must ask - if your primary uses are video editing/encoding, why do you want a notebook? That kind of work is best left for desktops, which are significantly faster and cheaper. Quad core laptops with nvidia GPU's good enough to make CUDA worthwhile have next to no battery life and generate tremendous heat, even when idle. Is it not an option to buy a cheap PC to handle the work and then a down-scaled laptop for actual portability? If you search for deals you can get a Core 2 Quad downright cheap these days, and laptops for tooling around with are very affordable.