=head1 Core Changes
+Binary numbers are now supported as literals, in s?printf formats, and
+C<oct()>:
+
+ $answer = 0b101010;
+ printf "The answer is: %b\n", oct("0b101010");
+
The length argument of C<syswrite()> is now optional.
Better 64-bit support -- but full support still a distant goal. One
=head1 Modules and Pragmata
+=head2 Modules
+
+Dumpvalue module provides screen dumps of Perl data.
+
+=head2 Pragmata
+
Lexical warnings pragma, "use warning;", to control optional warnings.
Filetest pragma, to control the behaviour of filetests (C<-r> C<-w> ...).
=head1 Documentation Changes
-Todo.
+perlopentut, tutorial on opening things in Perl, was added.
+
+perlreftut, tutorial on references, was added.
=head1 New Diagnostics
-Todo.
+=item /%s/: Unrecognized escape \\%c passed through
+
+(W) You used a backslash-character combination which is not recognized
+by Perl. This combination appears in an interpolated variable or a
+C<'>-delimited regular expression.
+
+=item Unrecognized escape \\%c passed through
+
+(W) You used a backslash-character combination which is not recognized
+by Perl.
+
+=item Missing command in piped open
+
+(W) You used the C<open(FH, "| command")> or C<open(FH, "command |")>
+construction, but the command was missing or blank.
=head1 Obsolete Diagnostics