Originally Posted by
Wtfriday Do you think its possible to use the new gear VR headset and controller for daydream?
If you are ever wondering if your device supports DayDream. Just
look here 
Google has a nice list of supported devices and the list is growing every month as new devices get added

Galaxy S8 will definitely be supported but probably just needs a software update.
With its impressive Infinity Display and the most capable processor you can get in an Android phone today, the Galaxy S8 is the most capable mobile VR system you can buy today