The previous FQ400 made max torque @ 5,000rpm I think which is far too high, and frankly rediculous when you can upgrade an EVO 8 with a 20G turbo and make the same power and torque, but the torque will be maxed @ 3,500 - 4,000rpm.
I think you'll find the new one will come on a lot faster, and have a lot more than 500Nm like the previous FQ400, because the EVO X FQ360 already makes 500Nm @ 3,500rpm with the stock turbo!
Like I said, I don't think lag will be much of a problem considering the FQ360 model is already making 500Nm (370ft-lb) @ 3,500rpm. The FQ400 will probably make something around 400ft-lb (540Nm) @ 3,500-4,000rpm, meaning the car will mjake boost down around 2,000rpm onward. 0-60mph in 3.5s is brutal, and probably 0-100mph in under 10s. Not bad for a 2L.