You surely don't need to understand Japanese to understand what's going on with Raiden and these boss battles in the latest Metal Gear Rising: Revengeance trailer. These are proper bosses too. That's an important distinction to make in a game that throws scores of mini-bosses at you --along with low level grunt enemies-- consistently in the form of giant walking tanks. You're always facing something or somebody that's going to take several well-timed sword attacks to defeat. And they'll always be angrily trying to kill you too. The main difference with the boss battles, as we all know, is that whatever attacks you do land are barely going to cause any damage while their attacks will be devastating to you. Even cyborg ninjas like Raiden have the work cut out for them in situations like that.
I can tell you a thing or two about the bosses featured in this trailer though. The first one is a piece of cake and you get to steal her weapons after. The second guy, who can disassemble himself as will is a pain in the arse for real. The third guy wasn't too annoying so I'd say tougher than the first but not as tough as the third. The last guy they show, Samuel, is maddening. It's mainly because he's a cyborg ninja like you and you've had a previous run-in, shall we say. That's a classic video game trick, though, to make a boss the mirror image of the hero, and I'm totally down with that in Revengeance because this game is all the way retro in the best sense of the word.