1.0-rc4 -- the "last" RC!
Here are the changes that may affect you:
* Functions.forMap(Map) now has no default-default value. The function it
   returns just throws an exception now on an unrecognized key. For the old
   behavior, use forMap(Map, null).
* ForwardingMap no longer has createEntrySet(), createKeySet() and
   createValues() methods. Just override entrySet(), keySet() and values()
  like usual. Cache your view collection in a field IF you want to; this is no
   longer done for you.
* In ImmutableMultiset.Builder, the add(E, int) overload is renamed to
  addCopies, while other overloads are unchanged.
* Ordering.givenOrder(), which was superseded by Ordering.explicit() in
  rc1, is now removed.
* MapMaker.loadFactor(), a method no one should really use, was removed;
  unfortunately, there's no time left to go through a deprecation cycle, but I
  doubt this will affect many people. This alters the serialized form of 
  "MapMade" maps, so the serialversionuid has been incremented.
It's really do-or-die time now, folks -- time to send in any last feedback before these APIs become set in stone for a long, long time!
-- 
Kevin Bourrillion @ Google
internal:  
http://go/javalibrariesexternal: 
guava-libraries.googlecode.com