Always good to see someone familiar with them. Unfortunately, NSA is transitioning to some new program that allows rapid certification of COTS security products at what looks like EAL1 and in IIRC about 90 days. Great for time to market and COTS acquisition but bad for security.
Fortunately, DARPA, NSF, and other organizations are funding a lot of good work. Here's a few:
http://www.crash-safe.org/
https://www.cl.cam.ac.uk/research/security/ctsrd/cheri/
http://www.cs.rutgers.edu/~santosh.nagarakatte/softbound/
(See hardware papers like Hardbound and Watchdog)
http://safecode.cs.illinois.edu/sva.html
http://scholar.lib.vt.edu/theses/available/etd-10112006-2048...
Much of Galois Inc's work is government funded. That includes CRYPTOL language, Ivory language, Xen work, Haskell work, and so on. NSA partly funded demo's from Praxis (now Altran) on their Correct by Construction process with Z specs and SPARK Ada code. They built SPARK, too.
So, lots of stuff going on that is already practical. There's even more that are academic prototypes or exist in simulation. Leaving them off for now.