It was replaced by the SIR 9 which can be run SS or Geared.
...except the SIR 9 did technically always have the SS or geared option. The MCR also had top cable-routing and a [normal] BB. The SIR is one awesome frame, don't get me wrong... But the extinction of the MCR... it's a damn tragedy... best production geared steel 29er... EVER.