Recently in the Beta Blizzard has switched Aspects to be on their own global cooldown (gcd) rather than on the Hunters. This was done to let us switch between aspects more freely and so that doing so doesn't hurt our damage output or our ability to use deterrance / wing clip etc...
However, because the aspects are on a 1 second gcd separate from everything else, it is possible to switch between two of them very quickly to benefit from both at once.
There are a number of ways to abuse this, for example you could have:
/cast aspect of the hawk (or aspect of the dragonhawk if it makes it to live)
/cast aspect of the viper
at the end of all of your macro's (make a macro for arcane shot, for example, that was /cast arcane shot, /cast aspect...). Switching between them very quickly (every 1 second) allows for them both to be active at once.
Obviously you could use an autoIT program or whatever to do it more effectively, but this is just one method.
Thought I'd point this out, cheers.
This was implemented in Beta version 9095 and might make it to live.
Appears to be patched.