This is probably more interesting for Surface (RT) users than general Windows 8 users.
Microsoft is going to enable flash content in IE Metro by default, instead of using the white list.
http://blogs.msdn.com/b/ie/archive/2013/03/11/flash-in-windows-8.aspx
I don't buy the reason, but that doesn't really matter.
Posted a thread here: http://www.neogaf.com/forum/showthread.php?t=522723