Lua devs released a few days ago a
beta version of the upcoming 5.2.
I tried to adapt the
slackbuild.org build script for the new version:
http://ponce.cc/slackware/testing/lua/
hope can be useful to play with it a little early: I seem to have spotted many Lua users here and, as you can read in the link above too, there are
many changes from 5.1.x and some incompatibilities.
EDIT: for the reasons above, if I were you, I won't use it to upgrade a 5.1.x package installed as a dependency of another package! Instead, can be handy for porting/testing lua code written for the new version.