New MBAs Intel 6000 = 4K external?

[Santabean2000]

So, it's almost a lock for Intel 6000 to be in the new MBAs coming next week. My question is, will they be able to push 4K on an external screen?

[The rMBP13" with 6100 = 4K?]

 

[cbautis2]

It should do 4K @ 60Hz now. Current MBA can do 4K @ 51 Hz