* doc/misc/efaq.texi (New in Emacs 27): Add section.

diff --git a/doc/misc/efaq.texi b/doc/misc/efaq.texi
index 0fc91933f4b09d1581ef0d6df6e2a5b2c792fbf6..e9703e7519713cb0836d34ac4fa985db5a93ef91 100644 (file)
--- a/doc/misc/efaq.texi
+++ b/doc/misc/efaq.texi
@@ -901,6 +901,7 @@ status of its latest version.
 @menu
 * Origin of the term Emacs::
 * Latest version of Emacs::
+* New in Emacs 27::
 * New in Emacs 26::
 * New in Emacs 25::
 * New in Emacs 24::
@@ -970,6 +971,63 @@ Emacs, type @kbd{C-h C-n} (@kbd{M-x view-emacs-news}).  As of Emacs 22,
 you can give this command a prefix argument to read about which features
 were new in older versions.
 
+@node New in Emacs 27
+@section What is different about Emacs 27?
+@cindex Differences between Emacs 26 and Emacs 27
+@cindex Emacs 27, new features in
+
+@itemize
+@cindex bignum support
+@item
+Emacs now uses the GNU Multiple Precision (@acronym{GMP}) library to
+support integers whose size is too large to support natively.  The
+integers supported natively are known as ``fixnums'', while the larger
+ones are ``bignums''.  All the arithmetic, comparison, and logical
+(also known as ``bitwise'') operations where bignums make sense now
+support both fixnums and bignums.
+
+@cindex HarfBuzz
+@item
+Emacs now uses HarfBuzz as its default shaping engine.
+
+@cindex JSON, native parsing
+@item
+Native support for @acronym{JSON} parsing that is much faster than
+@file{json.el}.
+
+@item
+Cairo drawing is no longer experimental.
+
+@cindex portable dumper
+@item
+Emacs now uses a ``portable dumper'' instead of unexec.  This improves
+compatibility with memory allocation on modern systems, and in
+particular better supports the Address Space Layout Randomization
+(@acronym{ASLR}) feature, a security technique used by most modern
+operating systems.
+
+@cindex XDG convention
+@item
+Emacs can now use the @acronym{XDG} convention for init files.
+
+@cindex early init file
+@item
+Emacs can now be configured using an early init file.  The primary
+purpose is to allow customizing how the package system is initialized
+given that initialization now happens before loading the regular init
+file.
+
+@cindex tabs
+@item
+Built-in support for tabs (tab bar and tab line).
+
+@item
+Support for resizing and rotating of images without ImageMagick.
+@end itemize
+
+Consult the Emacs @file{NEWS} file (@kbd{C-h n}) for the full list of
+changes in Emacs 27.
+
 @node New in Emacs 26
 @section What is different about Emacs 26?
 @cindex Differences between Emacs 25 and Emacs 26