The last item may change with Perl6, for "=begin/end", but the rest will probably not.
Actually, the first point:
POD is the official way to do multi line comments in Perl
will also change in Perl 6, which introduces an indentable, nestable, multi-line-able delimited comment:
#( comment here )
#< comment here >
#« comment etc. »
A delimited comment is introduced by a #
followed immediately by any kind of opening bracket. It is closed by the corresponding closing bracket.