Auto-complete: Display "verbose" information for the currently selected completion

It would be very helpful (for plugin writers like me) if there was a place to display details about auto-complete options. In Eclipse, for example, the currently highlighted autocomplete suggestion has a tooltip-like panel displayed next to it that shows its documentation:

Eclipse's version of the feature is very fancy -- merely allowing multi-line text would be more than enough to greatly improve Sublime auto-complete plugins.

Thanks!