I had been waiting for a powerful machine. This summer i got a mid-09 15" mbp, 3 ghz, 4gh ram, 500gb hdd, 9600m/9600 GT. It is fantastic. Great for editing my HD video, multi-tasking. I love the keyboard, multitouch pad, layout, sd slot, battery life. If apple released a quad core mbp, or one with usb 3 or light whatever, i'd be completely content. I've been able to do so much on this machine since I got it in July and I wouldn't even think about trying to sell it and get a new one if these rumors are true.
Also, I'm not quite sure the whole mobile laptop with tons of power is the way to go. I'd rather have a 15" mbp, fairly powerful, but also a desktop machine like a mini or an imac. I didnt think this way when i was getting this machine, but now i'd love to have a mid range 15" mbp still with the ram and storage, but saved some money and bought a mac mini to go with it to do desktop stuff like eyetv recordings and itunes streaming. i really hate having to plug/unplug my usb eyetv hybrids and everything else. I do HD video editing, but no gaming. I am also a programmer so I need the large screen.
I built a server with solaris, and it'll soon be running to Ubuntu 9.10 (opensolaris wasn't what i hyped it up to be). I've realized I can have this do many of things I'd get out of a mac mini. Remote access, itunes streaming, video encoding, web dev. server.
If apple releases these new machines soon and you're complaining that you just bought one, be happy with what you have. Use it until it falls apart in 5 years. Be glad you arent trying to do your tasks on an OLPC, but be grateful you have what you have.