For those of you interested in using the SP3 with Miracast, I have tested it using my Netgear PTV3000 and it works great out of the box. Since the SP3's screen is 3:2 instead of the TV screen's 16:9, the SP3 screen will have black bars (letter boxed) across the top and bottom if you connect in "duplicate" mode. That is to be expected though. Otherwise, it worked perfectly for me and with minimal delay.
This is good news since both the SP1 and SP2 required firmware updates before they would work with Miracast.
This is good news since both the SP1 and SP2 required firmware updates before they would work with Miracast.