''Based on Tcl/Tk 8.6a3''

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**Tcl Changes**

***Changes to Tcl Commands***
****New Commands****

   * [coroutine]   [http://tip.tcl.tk/328]
   * [oo::class]   [http://tip.tcl.tk/257]
   * [oo::copy]
   * [oo::define]
   * [oo::objdefine]
   * [oo::object]
   * [tailcall]    [http://tip.tcl.tk/327]
   * tcl::[prefix] [http://tip.tcl.tk/195]
   * [throw] 
   * [try] [http://tip.tcl.tk/329]
   * [yield]       [http://tip.tcl.tk/328]
   * [zlib] [http://tip.tcl.tk/234]

   * [tcl::unsupported]::[atProcExit]

****New Subcommands****

   * [binary decode] [http://tip.tcl.tk/317]
   * [binary encode] (ditto)
   * [chan pipe] [http://tip.tcl.tk/304]
   * [chan pop] [http://tip.tcl.tk/230]
   * [chan push] (ditto)
   * [info coroutine] [http://tip.tcl.tk/328]
   * [interp cancel] [http://tip.tcl.tk/285]

****Expanded Syntax / New Options****

   * [file delete] (''zero pathnames'') [http://tip.tcl.tk/323]
   * [file mkdir] (''zero pathnames'')  [http://tip.tcl.tk/323]
   * [glob] (''zero patterns'')  [http://tip.tcl.tk/323]
   * [global] (''zero variable names'')  [http://tip.tcl.tk/323]
   * [lassign] (''zero variable names'')  [http://tip.tcl.tk/323]
   * [linsert] (''zero elements'')  [http://tip.tcl.tk/323]
   * [lrepeat] (''zero elements; zero repetitions'')  [http://tip.tcl.tk/323]
   * [lsearch] '''-bisect''' [http://tip.tcl.tk/313]
   * [lsort] '''-stride'''   [http://tip.tcl.tk/326]
   * [namespace ensemble] '''create''' '''-parameters'''   [http://tip.tcl.tk/314] — see [ensemble with parameters].
   * [namespace upvar] (''zero variable names'')  [http://tip.tcl.tk/323]
   * [tcl::tm::path add] (''zero pathnames'') [http://tip.tcl.tk/323]
   * [tcl::tm::path remove] (''zero pathnames'') [http://tip.tcl.tk/323]
   * [variable] (''zero variable names'')  [http://tip.tcl.tk/323]

***Changes to Tcl variables***
****New global variables****

   * [tcl_platform]('''pathSeparator''') [http://tip.tcl.tk/315]  

***Changed Tcl behavior***

   * The following commands are script-modifiable [ensemble]s: [binary]
   * [lset] can now set the element at index '''end+1''', growing the list.
   * [string trim]* now uses a different set of whitespace characters as a default.

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**Tk Changes**
***Changes to Tk Commands***
****New Commands****

   * [ttk_vsapi]

****New Subcommands****

   * ''[canvas]'' '''moveto''' [http://tip.tcl.tk/236]

****Expanded Syntax / New Options****

   * New '''-angle''' option for [canvas] text items [http://tip.tcl.tk/119]

***Changed Tk behavior***

   * [GIF] [photo] [image]s written with [LZW] compression.

****New Events****

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**Changes to Bundled Packages**
***New packages***

***Updated packages***

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[Changes to consider when moving to Tcl 8.6]
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%| [Category Documentation] | [Changes in Tcl/Tk] |%
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