does this mean that with upgraded power supplies we will be given the option to go to ~6.3 THs ? Would this be something Spondoolies would offer as an upgrade option? I take it the power supplies in the SP30 are server supplies rated at 1200watts each and by the looks the just click and slide out, will you be supporting specific replacement PSU's and allowing software overclocking?

I think that you will have 6.3 TH/s by with the default PSUs. And yes the PSUs are server rated and they are click and slide out.