Afaik - the following have all been announced.
Punisher S1 (Fall 2017)
Jessica Jones S2
Luke Cage S2
Daredevil S3
I'd imagine that the announcement of Season 2 of Iron Fist won't be far off - it's reportedly had one of the biggest openings out of the five seasons so far, second only to Luke Cage if reports are to be believed. Now, whether some of them were watching just to see if it was as bad as the critics were saying or not, that's still pretty impressive - now whilst it took less than two weeks for Daredevil to be renewed for a second season, it took them almost four months to announce Daredevil Season 3, just over one month to order Jessica Jones Season 2 and two months to order Luke Cage Season 2. We could be seeing an IF S2 announcement any time between the end of March and the end of July (am guessing they'll build this into the Defenders press junkets).
Punisher S1 (Fall 2017)
Jessica Jones S2
Luke Cage S2
Daredevil S3
I'd imagine that the announcement of Season 2 of Iron Fist won't be far off - it's reportedly had one of the biggest openings out of the five seasons so far, second only to Luke Cage if reports are to be believed. Now, whether some of them were watching just to see if it was as bad as the critics were saying or not, that's still pretty impressive - now whilst it took less than two weeks for Daredevil to be renewed for a second season, it took them almost four months to announce Daredevil Season 3, just over one month to order Jessica Jones Season 2 and two months to order Luke Cage Season 2. We could be seeing an IF S2 announcement any time between the end of March and the end of July (am guessing they'll build this into the Defenders press junkets).