Craftbukkit build 1185 (which is compatible with Minecraft 1.8.x) has been released. We have installed it on all of the basic game servers. If you have a Premium or dedicated server please open a support ticket to have build 1185 installed.
As with all new builds of Minecraft/Craftbukkit backup your world and nether before changing version.
At this time we have not done extensive testing with popular plugins. We will do that today and tomorrow. Due to the extremely high request for the latest version of Craftbukkit we wanted to get this in as soon as possible. Please post comments with plugins that you find to work or not work with build 1185.