The X4 will utilize the X3 drivetrain and platform just as the X6 does with the X5. Assuming the X4 follows the precedent set it is already outgunned by both the Macan S and Turbo. Both models offer more power, torque, as well as a quicker shifting dual clutch transmission to the 8-speed automatic used in the X3.
Will the X4 receive an update? It will almost need it especially considering there also is the Mercedes-Benz GLA45 AMG to contend with. Is the vehicle supposed to just offer different looks from the X3 or actually an improved driving experience? Is it just supposed to generate maximum profit at minimum investment by platform/drivetrain sharing?
We will have to wait and see if BMW does anything interesting with the X4 but as of right now if it does use what is available currently in the X3 then there are more exciting performance options in the segment. Not to mention Audi is bringing the RS Q3 stateside as well.