I have done a fair amount of web searching also, and there are several seemingly reputable sources which are saying the Defender will be back in the US in 2007 as a 2008 model.
Check out these two links: One is MotorTrend and one is direct from Atlantic British's website
http://www.motortrend.com/future/spied/112_2008fvf/index2.html
http://www.roverparts.com/Vehicle_Reviews_LR_Defender_2007.html
Sure it will look different than the 90s Defenders no doubt. But look at the aesthetic differences between the RRC and the newest 2003 Rangie. I have two RRc and they are awesome, but I also think the newest Rangie looks great., albeit really expensive! The two Rangie's have changed drastically, but they are both awesome in their own unique way and they serve different purposes.
From the article on AB, it seems like when they return, you will have numerous options, like buying a manual softtop with as few add ons as possible. That's probably what I will do, as I already have two RRCs to take wheeling. I would get a Defender as a summer topless beach and around town cruiser so therefore a new one to me would make a lot more sense than a 10+ year old truck that costs more now than it did when it was sold new.
The laws of economics dictate that when the new models arrive, the old Defenders price will plummet fast. Sure there are people who would rather have a "collector's edition" model from the 90's (the type of people on this board no doubt), but many people who own them (think the Martha's Vineyard, Hamptons crowd) will immediately trade up to the newer one and the market will be glutted with 90s models. Simple supply and demand.
I hope the rumors are true. Does anyone out there have any substantiated information regarding a 2007/2008 Defender in the US??