You forget about the massive ilvl of this tier and as a result the massive secondary stats that can be reforged.
Here is something I came up in 5 mins, based on preliminary SimC weights for T13 BiS. It has expertise cap, more hit than I can get rid of, I only put (fierce gems) in yellow sockets and (etched) in blue where applicable. Nothing else is gemmed since it will be Bold and won't affect haste. I also enchanted the boots as it is the only Haste enchant we'll use.
Again, please notice that I used extremely greedy reforge of reforging to Haste on every item that didn't have Haste and making sure I get the Expertise cap and hit cap. The reforge is awful, as it is over hit cap by a good 300 points or so. I believe one item should be changed to get rid of some hit :
http://ptr.wowhead.com/compare?items...79:78479:78550
As you can see it uses trinkets and weapons with 0 secondary stats and yet it has more Haste than T12 BiS.