That's funny I was searching for a big-bore last night also and found that listed. I'm gonna put my money down and wait for one of those though. Won't make much sense to buy an XC and convert it to mx for a few months then the SX comes out. I'll have to talk to my friends at max power about that big bore though.
dont waste your time at max power, i already spoke to cliff larkosh about it indepth. they have no plans to get into the big bore market with the ktm's becuase of all the big bore support & parts already available from ktm. which makes since i guess...
they already have a stroker crank, big bore cylinder, etc. to fit the 450/505 sx-f motors. the best advice i can give you, is that if you are sure that you are going big bore, save the money up front and just buy the 450...