They just announced the base fighting styles on the producers blog. There are 8 basic styles, with 3 blocking styles and 3 punching styles, if my understanding is correct. On top of that, you can choose you can choose a best punch to give it a boost. Their example is the Frazier left hook. That's a pretty nice touch.
Conventional Boxer: A boxer that sticks to the fundamentals and tries to set things up with the jab.
Unconventional Boxer: A boxer that eschews the fundamentals for a more dynamic approach.
Slugger: A roughhouse power puncher that likes to throw bombs, thinks the best defense is a good offense.
Brawler: Another power puncher, but one that shows more defensive ability.
Counter Puncher: A slippery, in-the-pocket defensive style fighter.
Boxer Puncher: A boxer that takes a conventional approach to setting up his big punches at medium distance.
Inside Fighter: A close range boxer-puncher that moves his head and tries to control the ring and work the body.
Outside Fighter: A stick and move fighter that focuses on keeping the opponent at the end of their punches.
http://blog.fightnight.easports.com/
One thing I missed at first was the mention of creating a boxer and importing them into Legacy as an opponent. That's pretty cool.