Don't get too excited, it's a 9/9.8W 8/16 channel controller for big enterprise SSDs. Hopefully a cut down model will be out soon enough that consumer PCIe5 SSDs will be out at the same time that Alderlake makes the interface available to us.
https://www.anandtech.com/show/16703/marvell-announces-first-pcie-50-nvme-ssd-controllers
https://www.anandtech.com/show/16703/marvell-announces-first-pcie-50-nvme-ssd-controllers