Interview via GNN Gamer (Google Translate)
Note: there was a mis-translation regarding 3 expansions, Miyazaki only confirmed 2 for Dark Souls III - first is in Fall 2016, second is early 2017.
On the future of Dark Souls and confirms that development on a new IP has begun:
Q: How many DLCs will there be?
A: We will make three large DLCs as planned. First one will be out in Fall 2016, Second one in Early 2017, Third one doesn't have a date yet.
My take on this: he personally doesn't want to develop more Souls type games right now, but if his subordinates (aka Dark Souls 2 "B team") want to make them - he will let them. No plans for sequels, tie-ins or spin-offs right now means no Bloodborne 2 =(
Q: I know you said there wonít be any sequels and Dark Souls 3 marks the end of the series. But is this world really coming to an end? Is there a chance there would be some kind of DLC, spin-offs or tie-in novels set in this world?
A: Dark Souls 3 will be have several DLCs like previous games. But thereís absolutely no plan right now for any sequels, spin-offs or tie-ins. But I canít say for certain the possibility is 0%.
For example, if a FROM Software developer come to me five years from now and beg Ďplease let me make another Dark SoulsĎ. Then I will not rule out the possibility to let my subordinates start a new project.
What is certain for now is, to me personally Dark Souls is over. So rather than make another sequel, I think itís time we take a step to a new direction. Development of a new IP has already begun.
For the Demon's Souls faithful:
That's not what GAF wanted to read D=
Q: So we wonít be seeing a Demonsís Souls sequel or remaster any time soon?
A: We want to try making new things.
On Armored Core:
Lots more interesting tidbits at the link provided. Translation is rough.
Q: What about Armored Core sequel?
A: Personally I want to do it. After all I was involved in three games in the series.
Armored Core is one of the pillars of FROM Software's lineup, but I can't reveal anything at the moment.