Just over a year ago, I looked at Lua 5.2 (work 3). Lua evolves slowly, and 5.2 still isn't quite finished, though perhaps it will be by the time the Lua Workshop 2011 rolls round in September (at which I hope to give a talk). In the mean time, Lua 5.2 (beta rc2) has been released, and this time I've identified the changes since 5.1 by annotating the new reference manual with them: An Annotated Lua 5.2 (beta rc2) Reference Manual.

Presenting the changes inline with the reference manual, as compared to just listing them, provides more context for the changes, as well as making things easier to consume by reducing the density of new information. If you have any good ideas for other ways of presenting this change information, then get in touch.