This is not an X-challenge engine. This is the likely the old F650gs engine with different coloured casings. Nothing wrong with that, it was a good engine. It's likely to have a new computer so tuning will have to wait until a new power commander comes out but most BMWs are smart machines and respond well to new exhausts and filter and removing any obstacles to breathing. It's likely you'll get more response instead of more power but if power is your bag this is probably not the bike for you. This is a commuter/tourer/all rounder/green-lanes maybe type machine and is probably going to be very competent.
Is it only me that thinks that BMW rebuilding the old F650gs into a new machine is a smart and good move for everyone? It's not for me but if I had to choose it would be this over every parallel twin every single time.