It's a big step forward on the business end of things. This isn't something "fight fans" can get excited about, but what it basically means is that the UFC has expanded to the point where Lorenzo and his position is needed full-time, and it also shows they're quite serious in terms of expanding the brand internationally (eg. in Brazil). And, perhaps, it's even more serious considering what Lorenzo is leaving behind (the family business where he's earning a ridiculous amount of money).
So no, on the surface and in the immediate short-term, this doesn't seem like a big deal. In the long term, this is potentially a huge step forward.
Arlovski/Buentello and Freeman/Griffin might not be enough for me to buy. Man! Chuck is dominant. He can't be taken down anymore, you have to beat him on his feet. If he really wants to challenge himself he needs to take on Silva.