So it turns out the 45e is an I6 rather than an I4 as was used in the outgoing 40e:
https://g05.bimmerpost.com/forums/sh....php?t=1532990
This surprises me because I had expected more power from BMW's second generation I6 hybrid setup when it finally hit the market, such as perhaps a "50e" with 450hp or even more. Per the X5 45e press release, the TwinPower I6 used in this application is the least powerful BMW has ever released for regular production - nearly 100hp shy (on its own) of the new B58B30O1 coming soon to the G20 M340i and G29 Z4 M40i.
Furthermore, it's a shame that the 40e will be left with no immediate replacement in terms of a high output four cylinder PHEV setup that exceeds the power of any non-hybrid four cylinder model BMW offers. When you look at Volvo's top of the line T8 I4 hybrid setup, it shows what can be achieved. Indeed, BMW has also just announced (but followers of this thread knew was coming for years now) the B48A20T1 with 300hp, which could have been used instead in the 45e, matching its output with two less cylinders. Presumably this was determined to be more costly and/or not as efficient. But it is nevertheless unfortunate from my perspective to see BMW apparently backing away from augmenting their four cylinder and six cylinder engines with electric motors to the effect of producing more power than those engines could on their own.