Not the newest of all news but I think it is still important to point out.
As far as I know Nature, Photo and Protrekker series are no longer in production. Instead Lowepro has come up with a whole new Pro Trekker series that comes in three different sizes in a more National Geographic kind of look aimed at nature photographers.
Lowepro writes :  “The ultimate expedition camera backpack.
Trekking to remote and challenging locations. Camping out on “the set.” Bringing along a big lens for that elusive creature. Being prepared for a surprise rain or sand storm. Outdoor and adventure pro photographers equip for all kinds of scenarios when they set out for a wilderness shoot. The Pro Trekker AW camera backpack helps prepare them with a list of inventive and practical features that’s really, we mean really, comprehensive.”

More at info about sizes and what have you at LOWEPRO