I'd just like something in between a high maintence 450+cc plated race bike and the heavy arse 600+cc bikes. For those of us who want a realatively light, low maintence bike that is good for medium distance rides over rougher terrain, there's nothing new available.
250cc race bikes might make as much or more power than the aniemic Japanese KLR, DRZ and XR 600/650s, but they don't come close to the liquid cooled Euro 600s, even older ones.
450cc race bikes might come colse to the HP but the big bores Euros have more grunt. Whenever one of my friends gets a "new" 450 MXer, they want me to ride it thinking how impressed I'll be after getting off my 650 Berg.
They're not all that for off road/desert use. And niether are low maintence/reliable and street friendly.
I've been riding 610s since the early 90's and I'm just making the observation that there's probably a market for the big gap between the 510 and 610/630.
I'll just hang onto my old iron I guess. Not saying they are better, just that they suit my needs better. If a 530 KTM held more oil, or better yet, a 570 Berg had more fuel and oil capacity-and a plate, it might be perfect.