Given a lot of brands in 2022 shipped AMD Advantage laptops but only one (HP on their Omen 16 AMD Advantage Edition) actually shipped with Smart Access Graphics, I doubt the Framework Laptop 16 will have Smart Acess Graphics, especially when Lenovo’s premium AMD Advantage laptops from 2022 did not get it.
As for the Framework Laptop 16, it has been confirmed to have a MUX switch though, so it will be possible to reroute the internal screen to the dGPU via a toggle in the UEFI. So you while you will be able to bypass the iGPU, it will likely require a reboot.