According to the leaked roadmap, this year Intel will release not only 13th generation Core desktop processors (Raptor Lake), but also compact computers based on them, which will be part of the NUC 13 Extreme (Raptor Canyon) family.

Like the current NUC 12 Extreme, NUC 13 Extreme will retain the modular design. The processor, RAM and drives are connected to the Compute Element module, which looks like a video card. However, the NUC 13 is much larger than its predecessors, and already hardly fits the definition of a “mini-PC”: 13.9 liters of volume versus 8. This is most likely due to the increased requirements for the cooling system.

As for the “stuffing”, NUC 13 Extreme are based on Core i5, i7 or i9 series processors with an overclocker index K. There is support for a PCI-E 5.0 x16 slot. Unfortunately, these are all currently known details.
According to the roadmap, Intel will release new NUCs in the fourth quarter of this year.