Hey Jon, I'm pretty confident in my answers, but not 100% sure as I never used the MK1 model before.
Yes there is an SD card slot. It only lows you to store waveform data and Cue Points on the card though. You cannot play music off the SD card. Also, it is not SDHC compatible as far as I know, but you shouldn't need that much space on a card with the 1000's anyways.
The "Tempo" control has a variation of +/- 6%, +/- 10%, +/- 16%, and +/- 24%. So yes, it is greater than 10%, but it does not include the "WIDE" range.
I hope this helps. :)