As discussed here Modified version to $:/core/ui/ListItemTemplate to show pop up for the list links
I had tried to hack the listitemtemplate to show pop up preview on hover over links. What i did was clone the core listitemtemplate and used the modified version where I needed.
<div class="tooltip">{{!!title}}<div class="tooltiptext"><$transclude tiddler="$:/core/ui/ViewTemplate/body" mode="block"/></div></div>
I haven’t used it much on daily basis since its not yet in a usable state (have to do some CSS magic there).