Panther Lake-U appears to be a sequel to Lunar Lake. Hard to say about Panther Lake-H, since it looks like Arrow Lake-H but dials back P-cores. That could be fine for most laptops and gaming.
Panther Lake-H having 4 or 12 Xe cores shows that chiplets change the rules of the game for mobile. Intel is no longer limited to making around 2-3 monolithic dies and disabling them heavily or using them in the wrong places. They can simply swap in a different iGPU chiplet. The version with 4 Xe cores will probably be paired with dGPUs, and the one with 12 Xe cores will be used by itself. Compare to the Alder/Raptor Lake chips with the best graphics of the lineup (80-96 EUs) being paired with dGPUs, simply because those are the ones with the most CPU cores and highest clocks.