Hi,
1) According to licensing rules yes, search for "asa licensing", there are several detailed documents.
2) This is true according to the feature descriptions, never tried it myself
3) I'm afraid not yet, RA VPN is not on the feature list for active/active AFAIK
The rest:
It's the other way round: for active/active you have to run multiple context but you can run multiple context without a/a failover.
The last sentence is correct according to the feature descriptions.