Board Thread:General Discussion/@comment-6431205-20130605125610/@comment-1210805-20130608100427

Straight from the mouth (or rather, tweet) of Kojima:

"I'll depict "Revengence" in MGSV but isn't "Vengeance" that ends once killed. I'll depict "Chain of Revengence" that lies b/w groups(race)."

"This false chain won't stop and this "false spiral" will be carried on to next generation"

So the idea of revenge is what is passed on to the next generation and this is about revenge against other races of people. I wouldn't be surprised if race does carry a double meaning though, it wouldn't be the first time they've done this.