Add some items to development-branch release notes.

doc/src/sgml/release.sgml

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-$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.171 2002/12/18 02:06:23 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.172 2002/12/18 19:01:25 tgl Exp $
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 <appendix id="release">
@@ -24,8 +24,15 @@ CDATA means the content is "SGML-free", so you can write without
 worries about funny characters.
 -->
 <literallayout><![CDATA[
+Revised executor state representation; plan trees are read-only to executor now
 Information schema
 Domains now support CHECK constraints
+psql backslash commands for listing conversions, casts, and schemas
+TRUNCATE TABLE is transaction-safe
+Statement-level triggers
+System can use either hash- or sort-based strategy for grouped aggregation
+ON COMMIT options for temp tables
+extra_float_digits option allows pg_dump to dump float data accurately
 ]]></literallayout>
 
  </sect1>