According to CanonRumors, the upcoming Canon EOS-1D X Mark II will have one CFast card slot and one CompactFlash card slot.
Updated rumored specs of Canon EOS-1D X Mark II:
- New 22mp full frame Canon sensor
- 80+ AF Points
- New processor technology
- 15+ stops of dynamic range
- Nearly 15fps
- 4K video (max frame rate unknown)
- One CFast card slot & One CF card slot
- Slightly larger LCD
- To be Announced in February/March, shipping in April.
via: CR
Read More: Canon Rumors