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Finally, explorers also need to have consumer Gmail accounts. More so than with the Google+ account, this tip seems like a done deal at this point -- especially considering a Google account is integrated so much with the registration process for Google I/O, which is where Explorer Program sign-ups took place.
But the keyword is "consumer." Google Apps customers are out of luck for now, but a Gmail account is free anyway.
Nevertheless, this rule could initially present a number of problems for business use cases. In a way, it heralds the whole BYOD trend and concern if users want to use consumer apps and products (i.e. Gmail paired with Glass) for work and storing corporate information.
Furthermore, many companies might not want something as light, mobile, and eye-catching (no pun intended) as Glass to be used for work-related purposes with sensitive data onboard in case the device is stolen.