Sadly no….
It seems as though Apple will not add USB 3.0 or Fibre to the new machine…
FROM THE APPLE SITE…
“Connections and audio
Four FireWire 800 ports (two on front panel, two on back panel)
Five USB 2.0 ports (two on front panel, three on back panel)
Two USB 2.0 ports on included keyboard
Front-panel headphone minijack and internal speaker
Optical digital audio input and output TOSLINK ports
Analog stereo line-level input and output minijacks
Multichannel audio through Mini DisplayPort”