Right. Relax your cacks.
This is probably the best thing they could have said, given the circumstances, and it pisses off both the people who are for and against it. One side would rather they just tell everyone complaining to piss off, the other would have them fall on their knees and beg for forgiveness.
Fact of the matter is, a promise like this is a very positive thing. Sure, they could break it. But people remember, it would come back and bite them in the arse. After royally ballsing up Watch Dogs, which they spent approximately eleventy bajillion dollars on and staked their future on it, I don't think they can afford another screw-up. Everyone at management will be treading very lightly so as not to step on any toes. So, do I think they'll make good on their promises? In some form or another, yeah, and that's not bad.
Of course it's easy to squeal "BLAH BLAH BLAH CORPORATE GREED WE CAN'T TRUST THEM" But the fact is that there's real pressure on them to improve, the fact that they went ahead and released a statement speaks volumes to that effect.
I for one, welcome the push for diversity. I don't think it should be so untrusting or suspicious (Like people here not believing what Ubi are saying) Franchises like Assassin's Creed or Tom Clancy will go on regardless, but changes are welcomed. The more people represented in games, the more people can enjoy them. Hell, I'd love to see an AC game based on the history of my country.
So, is this a sign of good things to come? Could be. But it's a sign nonetheless and nothing ever gets achieved without hope.