I inquired at Harrahs during the convention about the special Companion player's card that is issued for 7* members. Here's what I was told:

• Only one C card, per 7* member, per year; next year in March, the card expires and a new card can be issued to same or a different companion.

• Companion must have his own account number

• Companion's name is on the C card

• Good for 7* privileges (comps, parking, taxi line, lounge, etc), but does not accrue points to the 7* account with play
  

I'd say they will continue to be a pretty scarce item!