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I'm also guessing that the 2020 X3 M40i and X4 M40i have the updated 3rd Gen ZF 8HP51 transmission, but I haven't found any confirmation yet.
So far every other car that's moved to the B58 TU1 engine has also switched from the 2nd gen ZF 8HP50 transmission to the 8HP51. (New M340is and the 2020 Supras use the TU1 Engine + ZF 8HP51 transmission.) The 8HP51 has a wider gear ratio spread with a slightly taller (torquier) 1st-4th gear with 5-8 gears the same as the 8HP50. They're supposed to bring with them a 2.5% increase in fuel economy and have "revised hydraulics"; not clear whether that means less HP lost to running the pump or whether that means an increased ability to hold high pressure / more torque in Sport / Sport + mode or what that's supposed to mean in practice.
On the downside, I don't think anyone has cracked the TCU on the 8HP51s yet, so there's no tunes available for them, AFAIK.
Adam
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