Aside from a backhoe, which I'd really love to see, there should also be a mobile crane, where we had plenty of in 90s, 00s and 10s, but not so many in past years. With the Audi tires and a 3 axle setup, there are very cool ones available e.g. Liebherr LTC 1050, which would also fit in the "electric" category like the excavator from the 42175 or the upcoming Volvo L120 Electric Loader.
Again, a real tractor and trailer/attachment (I don't care if JD/Claas or without IP) is a must for me. The Xerion came out nearly 10 years from now.