As of December 2024, the MPI ABI proposals, one for C support and one for partial Fortran support, have passed the first vote by the MPI Forum.
There will be a second vote followed by a vote to approve the entire release of the standard containing the ABI, but it is unlikely that future votes will fail, given the lack of substantial objections to the current content of the proposal.
As noted in the previous blog
(part 6)
there is still work left to be done to solve the Fortran problem.
In order to get these parts right, we need to wait until the first phase
of the ABI is done and then implement standalone Fortran bindings on
top of it, as Vapaa is doing.
So far, Vapaa is focused only on MPI_F08 support, but we will also
prototype the legacy API to verify that nothing is lost if the
MPI Fortran API is implemented separately from the MPI C API.