3D artist said he works on tanks, so Hearts of Iron IV is likely... sadly.
Edit: Well, of course those tanks could be for East vs. West,
I don't know if PDS makes those tanks...
Well, he said that worked (or is working, he didn´t specify that) on tanks, but he also said that he worked on Bf3 and Bf4, so it could be from there. (Unless he meant that he is working on tanks now, which would lead to the conclusion HoI4 will come)
But how is Rome II shot down?
I think it was said in one interview.
But i may as well be wrong. I remember a thread some time ago, where it was collected what couldn´t be the next game. There was a link to an interview saying "no" to HoI4 and to RomeII.
interviews and in a stream johan said specifically that they are not working on rome 2. The same goes for victoria 3, I think it was in a interview he said that victoria 3 isn't worked on either (that does not mean that another expansion for victoria 2 might come).
But you got as many actual sources as i do, don´t you?

And an expansion for VicII won´t come. Podcat said it a week ago.