Take a look to my fork https://github.com/davits/vim you may find it useful in 
your endeavors. 
It introduces several function to show balloons at need (works only with gtk):
overlayshow(row, col, [list of items], is_pango_markup)
overlaynext()
overlayprev()
overlayclose()

Here is a small demo
https://files.gitter.im/Valloric/ycmd/l1M8/popup-overlay.gif

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