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For MongoDB 2.6 mongoexport was changed to export BSON datetimes as either ISO-8601 strings (datetimes since the epoch) or $numberLong (datetimes before the epoch). Drivers with JSON parsers must support decoding both types.
Note also that mongoexport outputs ISO-8601 format with localtime offset - in (+|-)HHMM format. This is likely a problem for languages that have no built in timezone support. See an example in SERVER-15278. In this case the driver will have to parse the offset and convert the result to UTC. Since the machine that parses the $date might not have the same timezone as the machine that ran mongoexport, returning a naive datetime isn't really an option.
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