13 MBPr and 4K

Hello, everyone,

There has been some confusing posts from apple about the 13" retina's ability to do 4K at 60HZ. Anandtech says it cannot do It, but apple no longer specifies which MacBook Pro is capable of driving 4K60. If anyone has a 13" retina and a 60hz 4k monitor, would you be willing to tell us how the 13" handles it? Thanks!