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@BobKamman wrote:

...And I don’t see where IRS has said it will use the bank account information that Social Security already has, to issue payments. That’s not in the law. They can use the SSA-1099 because they already have it..

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That's in §6428(f)(3)(B) Delivery of payments.—

Notwithstanding any other provision of law, the Secretary may certify and disburse refunds payable under this subsection electronically to any account to which the payee authorized, on or after January 1, 2018, the delivery of a refund of taxes under this title or of a Federal payment (as defined in section 3332 of title 31, United States Code).

Furthermore, the IRS' own press release says this much:

The U.S. Department of the Treasury and the Internal Revenue Service today announced that Social Security beneficiaries who are not typically required to file tax returns will not need to file an abbreviated tax return to receive an Economic Impact Payment. Instead, payments will be automatically deposited into their bank accounts.

“Social Security recipients who are not typically required to file a tax return do not need to take an action, and will receive their payment directly to their bank account,” said Secretary Steven T. Mnuchin.

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What about the people who receive Social Security, but also file tax returns, and owe taxes? Since they don't get a refund, will IRS know where they bank? Stay tuned.

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By a plain reading of the statute, §6428(f)(5)(B) is used only as an alternative to determine eligibility and to compute the amount payable whereas §6428(f)(3)(B) is the operative clause for the delivery of payment.  That should mean (not that they certainly will do) that even where the social security recipients file a return with balance due and provided the IRS doesn't have the direct deposit info from the taxpayer's return, they should resort to using the info from Social Security Direct Deposit if that was set up by the taxpayer.