It reminds one of the German WWII 88mm anti-aircraft gun that proved to be able to defend itself against tanks, was developed as an anti-tank gun and then as a tank gun. The barrel can be the same while it might be used for these different functions.Here's Skywatcher and his partner's take on this.
Yes, a new tank please and something that does not looks like an upgrade from the one before.
I can imagine that this gun would be awkward in a manned turret. Will it be part of a Chine tank similar to the Russian T-14?