What, realistic swordplay?!? Gedouttahere!

Actually, it would be pretty cool if they hired a true expert RL swordsman and gave him leeway to make it real in the game... pffft. Like that'll ever happen.
That would be cool, although perhaps challenging to implement effectively because of all the variety of fighting styles that come with using a variety of different weapons from different cultures and periods of time. Katanas are primarily for slashing, axes for chopping and bashing, short swords and rapiers for stabbing, claymores for hacking, maces for bashing, etc. Trying to make a system where all these weapons would realistically interact with each other could be a challenge. IRL, longer weapons have a huge advantage over shorter weapons, unless the guy with the shorter weapon can get close enough for what fencers call "in fighting," at which point, the guy with the long weapon is going to have to create some distance before he will be able to make much use of his big weapon.
I remember this one time back at fencing practice, there was this group of marital artists who were working out in the same gym and they were bragging about how their dual wielder could take out any fencer with a pair of sai. We all laughed cause those sai were not more than two feet long, but the martial artists were insistant, so our coach took them up on the challenge and defended himself with an epee. It was not even close. The guy with the pair of sai could not get close enough to land a single blow and our coach kept piercing the guy's arms with his epee (not literally of course, since these were practice weapons with plastic buttons on the tips). Just so we could finally have a definitive end to the challenge, coach finally let the guy get a little closer so he could pierce his heart. The martial artists packed up their gear and we never saw them again.
Distance is the key to winning a swordfight. Footwork is far more important than bladework. First thing you learn in any fencing class is footwork, and they will drill you on that for a while before they ever put a sword in your hands. Fencing has been described as "physical chess" and it would be awesome if they could program some of this stuff into a video game, but it might be quite a challenge to realistically depict a variety of different weapons going up against each other.