Are they completed? Dunno, but esf team never shows a17, a18 models.
I assume they are the ones that are probably not done/started yet. Who would want to see the androids over Gohan SS2… really? 
Not sure about #18, but I think #17 is completed, unless they decide to remake it, as it’s been done years ago, apart from animations probably.
Hope they are all done. I want the game to release soon! 