I like both changes, I still have to test the UHD settings real effect over animation and static, and over render time, but so far I find it cool.
What I don't understand is why the progressive engine controls (time/passes) are in the main settings but the bucket engine settings are not in main settings or even in scene tab, for me bucket is the main engine because it feels faster, it was faster before with adaptative rendering, I'm not sure about it now, but I'm really used to it and I prefer it over progressive, I prefer that way of configuring the desired final quality.
I'm not saying it should be the default engine at all, but I don't understand why this marginalization of these settings.
Cheers!