+* LyX now has "inverted" branch insets, which output their contents just in
+ case a given branch is not "activated". This makes inclusion of alternate
+ material in different versions easier.
+
+* When inserting a command or symbol in mathed, it is now automatically
+ wrapped in a real inset (either \text or \ensuremath) assuring the correct
+ mode, instead of being wrapped only in the output. The wrapping inset can
+ be safely dissolved, as it will be automatically inserted at export time
+ if needed, as usual.
+
+* The new setting
+ "Document->Settings->Fonts->Output em- and en-dash as ligatures" forces
+ output of en- and em-dashes as -- and --- when exporting to LaTeX.
+ It is is "true" by default but "false" when opening documents edited
+ with LyX 2.2.
+ See chapter 3.9.1.1 "Dashes and line breaks" of the User Guide and
+ "Caveats when upgrading from earlier versions to 2.3.x" below.
+
+* The following UI translations were dropped, because the lack of translation
+ maintenance: Russian, Danish, Greek, Serbian, Galician, Catalan, Romanian,
+ Dutch.
+
+!!Documents compilation process and images conversion
+
+* It is now possible to enable the -shell-escape option only for specific
+ documents, rather than having to enable it globally in preferences.
+ This is achieved by checking "Allow running external programs" in
+ Document->Settings->Formats. LyX will now check whether -shell-escape
+ has been added to a LaTeX converter and invites the user to remove it
+ in favor of the new mechanism when that LaTeX converter is used.
+
+* The converters definition syntax (LYX_HOME/lyxrc*) now supports a
+ new option, 'needauth', to prevent completely automated execution of
+ the converter, unless LyX acquired explicit consent by the
+ user. This is a new security feature, useful for converters that are
+ capable of executing arbitrary code, such as R scripts (used with
+ sweave/knitr), embedded within LyX documents. The user needs to
+ explicitly grant per-document permission on the first need for using
+ the converter on each document, unless he/she checks the "Don't ask
+ again for this document" checkbox in the permission dialog. The new
+ behavior can be fine-tuned from two new options in the preferences
+ dialog (see their description below). These also allow for disabling
+ 'needauth' converters altogether, if desired (default behavior).
+
+* LyX now supports insertion and automated conversion of Gnuplot scripts,
+ recognized by their typical extension ".gp" or ".gnuplot". These can
+ directly be inserted in a LyX document using the "Insert->Graphics..."
+ dialog, then selecting the Gnuplot script. LyX automatically adds a
+ proper "set terminal ..." and "set output ..." line to convert the
+ file to the needed output format (e.g., .eps, .pdf), depending on
+ whether the document is being previewed on screen or compiled as PDF
+ or other formats. Terminal options cannot be fine-tuned at the moment,
+ but that's a capability that may come soon, also according to the
+ received feedback from users.
+
+
+!!!The following pref variables were added in 2.3:
+
+* \default_platex_view_format
+ Determine the default output format for Japanese documents that use the
+ pLaTeX backend [default: "pdf3" == "PDF (dvipdfm)"]
+
+* \jbibtex_alternatives
+ Alternative bibliography converters for Japanese.
+
+* \pygmentize_command
+ holds the name of the driver command used by the Pygments python module.
+
+* \use_converter_needauth
+ when enabled, user is asked before calling any (possibly dangerous)
+ external converter with the 'needauth' option
+
+* \use_converter_needauth_forbidden
+ when enabled, use of external converters with the 'needauth' option is
+ forbidden
+
+
+!!!The following pref variables were changed in 2.3:
+
+* \bibtex_command
+ New (default) value "auto".
+
+* \screen_zoom
+ This is now independent of the value set via buffer-zoom[-in|-out].
+
+
+!!!The following new LyX functions have been introduced in 2.3:
+
+* buffer-external-modification-clear
+ Clear the external modification flag on the current buffer