There are going to be more Video Game character figures from Tamashii, they've just graduated to S.H.Figuarts now instead of having their own side brand. So, there'll be no more D-arts, they're just going to be Figuarts now.
I think this is because apparently several members of the same team worked on both lines, so it was probably seen as a waste of resources to split the team between projects.
Also, Tamashii has been very aggressive since last year in trying to grow their brand name outside of Japan, and the Figuarts brand has become one of the best and most popular action figure lines in the world. Since Figuarts carries more clout that D-arts, maybe they thought it was a good idea to just combine everything into the same category marketing-wise? Especially if they're going to expand into DC Comics, Nintendo characters, and musicians.