The splash screen functionality described here uses a pretty high res image. In order to use the native image without scaling it must be 128dp, which converts into some pretty hi-res images.
They start at 192px for older phones and go up to 512px.
In all, these sizes should be generated with manifest icon entries created: 192, 256, 384, 512
192, 256, 384, 512
More details here: GoogleChrome/lighthouse#291
Implemented in branch package_0_13
Came here to file just this. Discovered @paulirish has already done so and it's been implemented. Wooo! 🎉
To be released next week. Well, I already said that a week ago, but this time this is true :)
Ooh can't wait.