In this Google I/O talk from 2010<https://www.youtube.com/watch?v=ofhEyDBpngM>, 
a number of Datastore query features were described that seem to not have 
been released yet, including:

   - NOT subexpressions
   - set-like =! filters that aren't split into "< OR >" and return 
   intuitive results for multi-value properties via zigzag merge join
   - first class support for date range and geo queries
   - multiple inequality filters on normalizable numeric properties

As it has been 4 years since that talk, are any of these features 
(especially the last one) still on the roadmap, and if so, when are they 
slated for release?

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