Last Update: April 17, 2013
Pretty sure that's not all that recent. Over a month. How can we be sure it'll work with 1.5.2?
Because unless plugins modify base features of MineCraft, they will automatically work in the latest version of bukkit without having to update as they do not have to override any existing files. One example of this is the Citizens plugin as that modifys how players are rendred and allowed into the game and how chunk loading works and how the tab list works, so although it may not have to actually change any code when it updates, it will have to be recompiled again with the bukkit API for the newest version because minecraft stores all its files in names like aq.class and ez.class, which change for every update. I know this because in 1.4.7, the block class was ly.class but now it has become ad.class.
Anyway, back to my point. Most plugins will work from version to version without need to update (although in 1.6 every mod or plugin will break, due to the new file structure. Awaiting nightmare for me -_-). I run a server for me and my friends to play on and on it I am running plugins from all different versions, I think one is from 1.2.4.
Scene as this one changes how XP works, it will probably need to be updated though, but I might be wrong as I think bukkit has hooks for XP.
Hoped this helped!
Luis