I stopped into TI Sunday to redeem FreePlay. You may qualify even if you are not a guest. Many members of the MGM-Mirage Players Club get SOMETHING from TI, so be sure to stop by and check. You'll keep the same account number as before on your new card though the casino is now independant.
I wasn't there long but was surprised to see many $1/2/5 single-line machines right by the slot club with 9/6 Jacks, 9/7 DB, 9/6 DDB and 8/6 Bonus Deluxe. Didn't check High Limit, and I don't expect an invitation back, as all they will see from me is FreePlay redeemed and nothing afterwards.
Surprisingly, the tram to/from the Mirage still operates, though there isn't any real connection between the two casinos anymore besides that transportation.