Now that I’ve had time to get used to it and explore the UI, I actually prefer the new app. It’s given me the opportunity to eliminate and consolidate many discrete smartapps I had previously used to accomplish the same functionality. Developers should take a bow.
However (you knew that was coming)… please give priority to unifying the app rendering between Android and iOS (attn: @April, @kris). Compare the screenshots below of my Nest thermostat custom smartapp, taken simultaneously. The first image is how it appears on my Nexus 5; the second, as it appears on my wife’s iPhone 6. Notice the top of screen difference (Android shows that horrid Holo Blue, while iOS shows my “house” image…though the blurred house image does appear elsewhere in the Android UI). Also notice the reverse rendering of the multiAttributeTile, that Android shows the device name twice, how Android ignores the color attribute on the state (Cooling) tile, and that the text on the state tile does not scale in iOS. iOS always seems to render the white ring around the multiAttributeTile; with Android it’s hit or miss… even when using ST device types. And speaking of the multiAttributeTile, how is this image even possible? It’s clearly an Android phone, yet shows the multiAttributeTile with the iOS rendering (white ring with light center, radiating out to a darker gradient. Marketing department Photoshop? 
