Don´t know how one could consider such an announcement premature. We are talking about Patreon – Patreons quite rightly expect some information about the artist they are supposed to support.
Also, even the RESHOOT manual mentions a possible follow-up ... and there is some hint in the game, too!
If the premise of a follow-up damages sales, no Call of Duty or FIFA or Assassin´s Creed could ever have been successful. RESHOOT R is not due before Mid to end of 2017.