This was said a long time ago but there is no doubt the FMBT will be heavier than the Arjun Mk.2 this is the trend the world over for MBTs. There was a period when people assumed that APS and ECM would allow for the introduction of far lighter MBTs but now this has been abandoned and more and more armour is being put on the tanks increasing the weights. The FMBT will be no different.
Unless of course we go for an unmanned turret with crew emplaced in the hull.That way the overall weight can be reduced to say ~50-52 metric tons and still it would offer a protection level of far higher degree compared to current generation tank.I think that's the approach Indian authorities should take.