They could have left it without a subtitle, like the original game. Still, though the Turkish name doesn't translate to a very natural English one, one gets a vague idea that a banner lord would be someone in command of many troops. The name is adequate in my opinion and will quickly become synonymous with the sequel, probably used in preference to 'M&B 2'.
In the time honoured spirit of making wholly unreasonable leaps in logic, I would like to predict that Bannerlord will be available on the Amiga as well as the PC (since the programming language 'brainfuck', which M&B 2 won't be using, was written by an important guy in the Amiga scene). Will it be AGA only (A1200/A4000) or will A500 owners get a look in too?