I think it's worth noting that if you look at other products which fall under the (RED) umbrella, they're not all as literal as just being red in dominant color. GAP, Converse, and Armani in particular have a lot of products which feature a simple red accent. There could be an edition of the MacBook with a red glowing Apple, or an iMac with it's sides red, or some such varient, rather than having a laptop looking like that Ferrari one.
The iPod is obvious to go all red, and a red-metal Mac mini could follow, but I'd be surprised to see them take a whole laptop or iMac that color, but perhaps some of it.