=item *
+In future releases, non-PerlIO aware XS modules may become completely
+unsupported. Since PerlIO is a drop-in replacement for stdio, this
+shouldn't be that drastic a change.
+
+=item *
+
The current user-visible implementation of pseudo-hashes (the weird
use of the first array element) is deprecated starting from Perl 5.8.0
and will be removed in Perl 5.10.0, and the feature will be
=item *
+The C<exec LIST> and C<system LIST> will become fatal errors
+under tainting in some future release.
+
+=item *
+
The existing behaviour when localising tied arrays and hashes is wrong,
and will be changed in a future release, so do not rely on the existing
behaviour. See L<"Localising Tied Arrays and Hashes Is Broken">.