Earlier today we discovered this page for email updates on David Bowie Concert Tickets! As stated in the above screen grab "Sign up to be notified as soon as David Bowie tour dates are announced." This appears to be good news for Bowie fans, but we cannot confirm the possibility of a Bowie concert tour at this time.
UPDATE: A second site with possible Bowie concert tickets has been discovered here.
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New David Bowie Single & Album Comeback