Deps needs to be raised to >=2.5 (seems to apply to current version as well). Tests fail when dev-python/pylibmc is installed, but passes otherwise. Most likely an upstream bug - will look into it.
2.4 still fails, bug in 2.5 test suite and pylibmc still fails. I guess this is the same as 1.6.0, though - so nothing has changed. I've started to file bugs/post patches against upstream. Either wait for 1.6.3 (or when they get fixed) or bump to current since the state most likely won't get worse.
+ 26 Dec 2011; Patrick Lauer <patrick@gentoo.org> +beaker-1.6.2.ebuild: + Bump for #388315