Yeah, it has 2 sub outputs, for those that want to be that mad, and uses ProLogicIIz, which is a system whereby you can add front effect speakers (in a very similar style to the system Yamaha has been using for decades). This isn't a necessity, and normal 5.1 can be used.
It was pretty much the best AV amp under £500, and I can't see any reason why the 607 will be any different.