Well we do have photographs of the interior, but yes we still have no idea what it looks like underneath thoes front modules.
It just does not look like there is that mutch room for thick composite armour in there to me though. Judging by the position of the drivers hatch, the interior photographs and the start of the frontal slope.
This could however just be a quirk of the parade vehicle with the production Armata having 2m thick frontal composite armour for all I know though.