sh was renamed to shell in Org 8.2 [1] and this may result in some undesired behavior as it will fall back to the bundled ob-sh.el [1] http://orgmode.org/cgit.cgi/org-mode.git/plain/etc/ORG-NEWS
Since lang/org has grown (and is expected to grow much, much more), it has been given its own module category. Concerns #129, #138