(as of the releases of Tcl/Tk 9.0b1)
(page needs more development)

**Tcl Changes**
***New Numeric Syntax***

   * 0NNNN gets decimal interpretation, not octal
   * 0dNNNN forces decimal interpretation
   * NN_NNN_NNN, underscores allowed in numbers for digit grouping

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

   * [coroinject]
   * [coroprobe]
   * [const]
   * [ledit]
   * [lpop]
   * [lremove]
   * [lseq]
   * [tcl::process]

****New Subcommands****

   * [array default]
   * [array for]
   * [clock add weekdays]
   * [info const]
   * [dict getdefault]
   * [file tempdir]
   * [file home]
   * [file tildeexpand]
   * [info commandtype]
   * [package files]
   * [string insert]
   * [string is] '''dict'''
   * [string is] '''unicode'''

****Expanded Syntax / New Options****
   * [regsub] ... '''-command''' ...
   * [lsearch] ... '''-stride''' ...
   * [socket] ... '''-nodelay''' ... '''-keepalive''' ...

***Changes to Tcl variables***

   * [tcl_precision] no longer controls string conversions of doubles

***New encodings***
   * '''utf-16''', '''utf-16le''', '''utf-16be'''
   * '''ucs-2''', '''ucs-2le''', '''ucs2be'''
   * '''CESU-8'''

***Removed encoding***
   * '''[identity]'''

***Changed Tcl behavior***
   * [source] defaults to encoding utf-8
   * Unqualified varnames resolved in current namespace
   * Invalid encoding during I/O raises error by default
   * Pathnames no longer interpret ~ as home directory

----
**Tk Changes**
***Changes to Tk Commands***
****New Subcommands****
   * [tk print]
   * [tk sysnotify]
   * [tk systray]
   * ''[menu]'' id

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

   * ''[progressbar]'' ... '''-text'''
   * ''[frame]'' ... '''-backgroundimage''' ... '''-tile''' ...
   * ''[menu]'' '''add''' ... '''id''' ...
   * ''[menu]'' '''insert''' ... '''id''' ...
   * ''[image]'' '''get''' ... '''-withalpha''' ...

***Changed Tk behavior***

   * Scaling-aware widgets and themes with SVG support
   * Improved support of two-finger gestures

----


**Changes to Bundled Packages**
***New packages***
   * cookiejar 0.2.0
   * tcl::idna 1.0.1

***Updated packages***
   * [Itcl] 4.2.4
   * [sqlite3] 3.44.2
   * [tdbc] 1.1.6
   * [tdbc::mysql] 1.1.6
   * [tdbc::odbc] 1.1.6
   * [tdbc::postgres] 1.1.6
   * [tdbc::sqlite3] 1.1.6
   * [Thread] 3.0b1
   * [dde] 1.4.5
   * [registry] 1.3.7
   * [http] 2.10b1
   * [platform] 1.0.19
   * [platform::shell] 1.1.4
   * [tcltest] 2.5.6
   * [msgcat] 1.7.1

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