This story came up the other day on Phys.org:
Bringing balance to the universe: New theory could explain missing 95 percent of the cosmos
Here are a few excerpts:
However, this new approach looks very interesting, a) because it's a theoretical approach that modifies existing theories, and b) initial suggestions suggest it can make valid predictions.
It remains to be seen if it holds up, though - I've seen plenty of similar stories over the years in any aspect of astrophysics where a new model has some initial success but runs into difficulties when applied more widely.
Btw, as an interesting footnote, there was a story this week about a Type 1A supernova with a difference:
So, a supernova may have torched a star nearby . That could be important, because it's the assumption that all Type 1A supernova are standard which is the basis for claims of "dark energy".