Released
[http://sf.net/projects/tcl/files/Tcl/8.6.4/tcltk-release-notes-8.6.4.txt/view]
March 12. 2015

**Tcl Changes**
***Changed Tcl behavior***
   * Improved async socket connects [[[http://tip.tcl.tk/427%|%TIP #427]]]

**Tk Changes**
***Changed Tk behavior***
   * Debut of Tk Cocoa 2.0 .
   * New binding substitution ''%M'' [[[http://tip.tcl.tk/433%|%TIP #433]]]

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