Keep in mind that the Busa is a sport-tourer, like the original ZX-10, ZX-11D and the CBR 1100XX. Show the Busa some curvy roads and it'll be left behind your average sportbike. No, this bike is more destined to compete against the GSXR 1000, ZX 10, R1, 1198 etc. As for the WSBK title, it's a new bike, they'll probably make it, but it'll take time. As long as they've got a (supposedly) good base to wrok from, they should be OK.
As for the 4 stage ABS, I think it has different settings for aggresiveness. Maybe the 4th stage turns it off completely? 1 might be normal / automatic, 2 racetrack, 3 wet track, 4 off.