Add Outstanding Issues section

pep-3000.txt

@@ -193,6 +193,14 @@ To be removed:
   (Probably also just remove the thread module as a public API,
   in favor of always using threading.py.)
 
+Outstanding Issues
+==================
+
+* Require C99, so we can use // comments, named initializers, declare variables
+  without introducing a new scope, among other benefits.
+
+* Remove support for old systems, including: OS2, BeOS, RISCOS, (SGI) Irix, Tru64
+
 References
 ==========