I saw this link bait the other day...
We're NOT using Fortran anymore...
Many of us at the National Labs do modern, object-oriented C/C++... Like the project I'm in charge of: http://www.mooseframework.org/
There are whole labs that have completely expunged Fortran in favor of C++... Like Sandia (http://trilinos.sandia.gov) who actually went through a period in the late 90s and early 2000s where they systematically replaced all of their largest Fortan computational science codes with C++.
Those places that don't use C++ use C like the awesome PETSc library from Argonne ( http://www.mcs.anl.gov/petsc/ ) which actually employs an object-oriented scheme in C.
The big name modern codes that are getting run on the biggest machines are generally done in C and C++.
I don't see that situation changing anytime soon as there is simply a massive amount of C and C++ libraries that will continue to provide the engine for tomorrows codes. The trend i see happening most often is utilizing C and C++ libraries with Python glue for everything doesn't need raw speed.... I think that trend will continue.