Dana White says they've got an agreement but as far as I can tell there's no date set. Izzy says he won't be bulking up for the heavier weight class (apparently he did that himself while kickboxing, and it didn't go so well) and mocks Jon Jones for it in his move to heavyweight.
DW says he's hoping for Jones-Adesanya at 205 but with no mention of what happens to that plan if Blachowicz beats Izzy bloody.