Anybody know what this is all about: http://www.amazon.com/Tom-Clancys-Rainbow-6-Patriots-Pc/dp/B0062U5KG6/ref=pd_sim_vg_3

Not sure what you're asking.....it's the next R6 game that you can apparently now pre-order. It was scheduled to ship in 2013 so that would be one heck of a pre-order. UbiSoft is not listing it as coming soon yet tho. My guess is Amazon is just jumping the gun.

I have every Rainbow Six/Rogue Spear/Ghost Recon Classic game ever produced, except for the arcadey Vegas games and the dreadful title that came out before the Vegas games, but I had not heard one word about Rainbow 6 Patriot. I must be getting old. Now I'm the last to know.

Yeah, it's coming, but not until early 2013. Add the usual Ubi delays and that could go up to mid-2013 to 2015.
That's been in the works for a while though. More Rainbow in the US (boring) and they push moral decisions for the greater good and other BS that won't belong. They claim a return to old school game play, but to them Lockdown's probably old school. LOL
I wouldn't pre-order until there's a more firm release date. There's no way they'll put out the first Rainbow Six game in years a month AFTER Christmas. Q1 for Ubi is March IIRC, that's the earliest I think it would come.

Actually, you heard a few words about Patriots more than a month ago:

http://simhq.com/forum/ubbthreads.php/topics/3534984/Rainbow_Six_news.html#Post3534984