Will there be any sort of emulator for the Chromecast receiver itself? Or possibly a way I could run a secondary Chrome window on my laptop that behaves the same as the one on the receiver itself. This way developers can test their sender applications without actually having the physical receiver device on-hand.
Update: Our latest effort is a complete chromecast v2 receiver, called YouMap Chromecast Receiver, works very well on Android devices, including FireTV: http://forum.xda-developers.com/hardware-hacking/chromecast/app-youmap-chromecast-receiver-android-t3161851
We just released a chromecast emulator on iOS, freely available from App Store:
https://itunes.apple.com/us/app/rplay/id692511073?mt=8
Spent a few days to emulate Chromecast inside rPlay, finally it can find the rPlay (on Raspberry Pi) as a chromecast device, and it can send youtube URL redirection. still long way to go, but seems possible.
Attached is a screenshot of Youtube on Nexus 7, the Chromecast button is shown, when clicked, it will show rPlay as the device.
More info on rPlay: http://www.vmlite.com/index.php?option=com_kunena&Itemid=158&func=view&catid=23&id=10991
We will release chromecast emulators for windows/Linux/Mac/android/iOS in September.