It’s a new node with significantly less current leakage. There’s architectural changes that improves efficiency in certain C states as well.A "generational leap" from Intel's previous offerings, or a generational leap that makes them more efficient than AMD? I dont really follow the mobile market, but I would assume AMD is far ahead in power consumption in mobile as well, so a "generational leap" from intel might only reach parity with AMD's current offerings. We will see when (if?) Intel reaches process lead or parity, but I think they need a new core design to get power usage down to the level they need.
I don’t know how it’ll do against AMD’s mobile offerings but I’d be really surprised if it wasn’t more efficient or at least on par with Phoenix.
Edit: I’m assuming you’re talking about Phoenix, if you’re referencing Dragon Range (7945HX) RPL already has superior battery life compared to their chiplet mobile processors.