Placeholder sentence pointing out that imoprtlib has updated (as well as…

Placeholder sentence pointing out that imoprtlib has updated (as well as deprecated) ABCs thanks to the new .pyc situation.

Doc/whatsnew/3.2.rst

@@ -326,6 +326,11 @@ aspects that are visible to the programmer:
 * The :mod:`py_compile` and :mod:`compileall` modules have been updated to
   reflect the new naming convention and target directory.
 
+* XXX The :mod:`importlib.abc` module has been updated with new ABCs that
+  abstract out bytecode file details; some other ABCs in the module are now
+  deprecated in favor for the new ABCs (instructions on how to stay
+  backwards-compatible with Python 3.1 are included with the documentation).
+
 .. seealso::
 
    :pep:`3147` - PYC Repository Directories