A prototype for BMW's next-generation 5-Series has been spotted again.

The new mid-size sedan has reached a more advanced stage of development and a number of production-bound details can already be identified in the images.

The proportions are reminiscent of the much-loved E39 generation, while the headlights appear to be getting slimmer compared to the current generation. We can also see that the headlights taper back along the fenders, much more than in recent generations.

When it comes to what's under the hood, BMW is keen to give customers their powertrain of choice, at least until it makes the eventual switch to a fully electric lineup. As a result, powertrains will most likely include mild-hybrid, plug-in hybrid, and battery-electric options. Yes, an electric 5-Series, to be called the i5, is coming. In fact, prototypes for the i5 have already been spotted.

This flexibility is made possible by the latest version of BMW Group's CLAR modular platform that supports conventional powertrains in addition to hybrid and battery-electric options. There are reports that even the future M5 variant will offer the choice of plug-in hybrid or battery-electric power, which would be the first time there's more than one powertrain choice for the super sedan. Currently, we've only seen the new M5 testing as a hybrid.

Look for the redesigned 5-Series to debut in 2023 as a 2024 model. The M5 variant should arrive about six months to one year later. Before they arrive, BMW fans can look forward to new generations of the X1 and 7-Series, as well as the new XM performance SUV from BMW M.