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Q1.
Usually forwarding is total capacity is used for any forwarding whether unidirectional or bidirectional.
Mpps would depend what's installed in the chassis as the ASR 9000 also supports distributed forwarding.
 Q2.
http://www.cisco.com/en/US/docs/routers/asr9000/hardware/overview/guide/asr9kOVRGHAredundancy.html#wp710094
Q3.
http://www.cisco.com/en/US/docs/routers/asr9000/hardware/overview/guide/asr9kOVRGfuncdescription.html#wp706946