LXPanel 0.6.99.0 is the new alpha version of the LXDE component that brings with it some user and developer changes. This new developer version of LXPanel begins to use some functions from Libfm, the library based on glib/gio and designed aroudn GTK+ for offering various file management utilities. Libfm is used by the PCManFM file manager but now this desktop independent library is also used by the panel for leading to a simpler design and reducing the amount of duplicated code.
This new version of LXPanel also has a vastly simplified plug-ins API for easing support for third-party developers, a pager plug-in has been replaced by a new wnckpager, and there's new plug-ins. The new plug-ins are a built-in launchtaskbar and external weather components.
The new development version of LXPanel was tagged in Git and the development details were shared on the LXDE mailing list.