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Pro includes support for file geodatabases. Beta 1 supports uncompressed file geodatabase data. Beta 2 will support both compressed and uncompressed data.
Personal Geodatabases will not be supported in the initial release. We are investigating support in a later release.
ArcGIS Pro requires Windows 7 or Windows 8 on a 64-bit machine with a recommended 8 GB of RAM or more. More specific information on system requirements is still coming.