The motor needs some extra cooling so that apparently has received a pretty good upgrade. Thrustmaster seems to like their acronyms, so they are calling this cooling system the MCE. This stands for Motor Cooling Embedded. Few details were provided, but this system is in place to keep the motor at peak efficiency even at high transient levels of force. It does this without ramping up the speeds of the fans in the base. Hopefully soon we can find out how Thrustmaster was able to increase the thermal capacity in a base that is not all that much larger than previous products.
Thrustmaster is also implementing what they call a F.O.C algorithm (Field Oriented Control) that supposedly boosts the already impressive precision of the H.E.A.R.T. system (Hall Effect AccuRate Technology). I told you they like acronyms. This features the same 16 bit resolution of the T500 and T300 products, but it seems the new software reading the values is able to do a better job at it than previous parts.
Powering all of this is an external power supply that supports up to 400 watts of peak power. This is a peak number and not what it can do under constant load. That number is probably closer to 100 watts, but the specifics have not been released yet. The motor in the wheel base does not pull a constant amount of current, so its needs are varied depending on the type of inputs required by the application. When more force is required, it typically is not for extensive periods of time. It seems that the power supply that Thrustmaster is using is going to be quite a bit more powerful than those that were integrated into the T500/T300/TX wheel bases.