confusing the world with 140 characters or less...
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Slashdot's had an interesting discussion on G+ - it turns out that if you violate their terms of service (generally, the main way is by not using your real name - actors beware!), not only will Google suspend your G+ account, they will (by virtue of the fact that they're all tied together) suspend you from ALL google services, including picasa and gmail. And in spite of hiring a zillion people, customer service is not anything Google has invested one single dime in: there's nobody to call to get them to reinstate and nobody at google pays attention to the google user forums anymore.
Knowing this kind of an automated, senseless policy, I'll assume that they will tell you they're cutting off your gmail account by sending a mail to your gmail account.