i have a little different opinion. In the original devdas play and the movie itself devdas dies and paro is running towards him but is not able to reach devdas and devdas takes his last breath at her doorsteps.
but i think in mjht they may change climax a bit....or its possible that while samrat is enacting that last scene Gunjan has feeling that even he could have died instead of her sister and that she is about to loose him forever.....and this may lead her to confess her feelings in front of everyone.....