if Steve Jobs' latest customer email is to believed, it seems Mac users will have to continue to wait for USB 3, According to an email response inquiring about USB3 for Mac, Steve Jobs reportedly wrote:
We don't see USB 3 taking off at this time. No support from Intel, for example.
USB 3 has been previously rumored to be coming to the Mac Pro and iMac lines, though the latest email casts some doubt on how quickly Apple will adopt the new standard. USB 3 promises higher speeds for external devices.
