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Drop support for numpy < 1.7.0
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The Categorical type was integrated as a first-class pandas type
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New scalar type Timedelta, and a new index type TimedeltaIndex
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New DataFrame default display for df.info() to include memory usage
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New datetimelike properties accessor .dt for Series
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Split indexing documentation into Indexing and Selecting Data and MultiIndex / Advanced Indexing
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Split out string methods documentation into Working with Text Data
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read_csv will now by default ignore blank lines when parsing
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API change in using Indexes in set operations
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Internal refactoring of the Index class to no longer sub-class ndarray
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dropping support for PyTables less than version 3.0.0, and numexpr less than version 2.1