It's true that there are a ton of unknowns to us but I really hope that these unknowns are also unknown to HFs. I will go absolutely ballistic if they are trading on inside information that's not privy to common investors.
Also, tax-inversion vig. (Note that the MYL-ABT deal, which many investors expected to be canceled as a result of recent changes to the US tax code, is going forward: #msg-107440341.)