I'm kinda pissed that the PC version isn't coming out this year though...
PC versions of games rarely come out at the same time as console versions.
I hope they will improve fighting mode which gets really boring over the time.
The combat system was improved greatly in Assassin's Creed 2. You can expect to see even more improvement in Assassin's Creed Brotherhood.
In Assassin's Creed and Assassin's Creed 2, you traveled to various different cities. Assassin's Creed Brotherhood will, however, take place almost entirely in Rome. Don't worry though, Rome is insanely huge and divided into many different districts. What does this have to do with combat?
ACB will allow you to ride horses within Rome itself. You will be able to attack other mounted guards and steal their horse. You will also have access to a parachute that Leonardo De Vince designed. You will now be able to attack enemies from the air. You will also be able to have other assassins attack groups of enemies for you.
Most importantly, the basic combat system has been
changed. You should read the article I linked. To sum it up, guards will now attack more often as well as at the same time, and Ezio will be able to link counter kills together. Fights should not last nearly as long, but they should be much more exciting.