After reading more, I learned that. Not sure the Belkin gadget is any different from the other cheaper ones. Belkin just had the bucks to push it in the Android rags. Amazon has a 2 - 4 week wait for it other sellers seem to be shipping it direct from China which explains the delay.
Miracast does appear to be cross-platform standard that is not bound to the Google world. Supposedly does Win (8.1), IOS and Android (4.1+). If you are all Samsung, they seem to have their version built in but you need a little box at the set.
Anyone know if a Win 7 laptop can support Miracast or is it hardware dependent? I waiting for the upcoming dual Windows/Android boxes before I buy a new one. I am strung out across both now and wish they were better integrated. Not holding my breath for that.