Here is Midler's tweet:
Well HELLO! This Dolly has an announcement coming tomorrow ! Stay tuned!
— Bette Midler (@BetteMidler)
January 19, 2016
The tweet appears to suggest a major Hello, Dolly! revival. Showbiz411 added that Scott Rudin would produce, and went so far as to propose Brian Stokes Mitchell as Horace Vandergelder.
Singer/actress Midler, who made her Broadway debut partway through the original run of Fiddler on the Roof, returned with concert shows in 1973 and 1975, and made a recent encore as a performer in I'll Eat You Last: A Chat With Sue Mengers in 2013, and as a producer of Priscilla, Queen of the Desert in 2011.