New information pertaining to AMD Ryzen 7000 mobile APUs indicates Phoenix-H parts will offer up to eight 5 nm Zen 4 cores at up to 40 W while Raphael-H will go up to 16 cores and 32 threads above 45 W TDP. The mainstream desktop Ryzen 8000 series will come in two flavors — an all 3 nm Zen 5-based Granite Ridge CPU and a Zen 5 + Zen 4D-based Strix Point APU.
https://www.notebookcheck.net/AMD-Zen-4-Ryzen-7000-Phoenix-H-to-top-out-at-eight-cores-at-40-W-while-Raphael-H-will-offer-16-cores-at-45-W-TDP-Strix-Point-to-use-Zen-5-and-Zen-4D-hybrid.578607.0.html
Raphael-H could just be a slightly tweaked Raphael desktop chip put into laptops. Since Raphael desktop is expected to have some weak integrated graphics and all laptops with them would use a discrete GPU anyway. There's your first chiplet-based APU for laptops.
3+ Watts per core on TSMC 5nm would be sufficient for some good 16-core performance.