Given that these features are likely to appear in Alder Lake-S processors like the Intel Core i9-12900K, this makes sense, though we don’t know why Intel wouldn’t just include PCIe 5.0 and DDR5 in its ultraportable-class chips, too.
Intel Alder Lake-M processors, according to this leak, will supposedly replace the current-generation U-series chips found in laptops like the Dell XPS 13, with 7-15W SKUs meant for smaller mobile devices. Alder Lake-P, on the other hand, will supposedly support PCIe 5.0 and DDR5 and will be behind the H-series chips.
Also just like Alder Lake-S, it’s likely that these processors will also use a big.LITTLE hybrid design. That means we could potentially see CPUs with up to 14 cores in a laptop with these 12th-gen processors, but it would be similar to the Apple M1, with some larger high-performance cores and some smaller high-efficiency cores. So we don’t know how well that will actually translate to CPU performance.