From what details Intel provided they’re claiming “60%” better battery life for these mobile processors in “real-life usages”. Impressive if true, but just as exciting is the huge advancement of the graphics side with Xe2 which they claim will bring improved “gaming and graphics performance by 1.5x over the previous generation”.
It isn’t. The difference is pretty small, and it’s just optimizations for when copies can be skipped and not a radical change in the approach of how rendering is done.
Not at all. If big-ish changes were required, they could be exposed as Vulkan extensions.
Of course Vulkan, the graphics API used on all modern phones except Apple’s, supports using integrated graphics efficiently.