The 1190 SX is the streetfighter version of the 1190 RX superbike. Thus the V-twin 1190 c.c. engine, the frame and the single 386 mm front brake are the same at the 1190 SX. 
The engine could be slightly detuned in order to boost the low-midrange (138 Nm/8200 rpm) even more and the top end power could be slightly decreased from the 185 bhp/10600 rpm figure of the RX. An adjustable traction control, a LED headlight and a TFT display derive also from the RX. The upcoming bike will be officially revealed on July 4th.