That was a really vague blog. And it sounds to me like they're trying to make a ranger that takes from all four editions...
"Being at home in the wilderness" is obviously key to the class.
"Rangers have learned hard lessons... and are tougher than other characters" is an exceptionally feebly justification. Should a ranger who roughs it regularly be tougher than a veteran soldier? Tougher than a barbarian? It would make sense for them to have more endurance, which could be represented as a class bonus to Con or a couple of bonus hit dice for out-of-combat recovery.
"Protector" sure, why not? Let's wait to see what class abilities they propose to represent it. A ranger protects his companions by avoiding encounters, not by bodyguarding them in the midst of combat. But it would make sense for them to have combat stunts or tricks to influence the behavior of natural critters (make them choose a different target, make them flee for a round, that sort of thing).
"In their guise as hunters, rangers can choose to focus on an individual quarry, whereupon their hunter’s instincts kick in, allowing them to strike with enhanced lethal force."
This is the one statement that rubs me the wrong way. Like the statement about "Rangers are tougher", I don't understand how in the game world you justify this hunter's focus as something rangers have while fighters, barbarians, or assassins do not. I understand all the problems with favored enemy, but at least it made sense in the game world.
Now, the mundane classes have to have something to differentiate them, and the most important something is how they excel in combat. Each one should have a class ability that makes them an effective warrior (at least in some situations) and leads to a unique play experience. Barbarians have rage, rogues have sneak attack, fighters have a pretty consistent upgrade to AC and damage, and so on.
So what do you give rangers? I'd like to see a compromise between 3E's favored enemy, which makes sense in the world but doesn't come up often enough, and 4E's hunter's quarry, which works in every combat but feels like a generic fighter skill. A couple of months ago, someone else on the board suggested that they could get better with a chosen enemy as an encounter progresses--in effect, they could choose a new favored enemy for each adventure, and the more often they met that enemy the better their bonuses got. I thought that idea was excellent.