Yes, it is just replaced by the Grille 15, just like what registered user said.
Grille has one of the best guns (accuracy wise) and can keep up with most "hovercraft" mediums
fyi : WG has a track record of replacing the old tanks with new ones for balancing reasons and players just get all their XPs, crews and so on transferred
i.) replacement of t30 by t110e5 as the tier 10 heavy tank
ii.) replacement of fv4202 by the Centurion Action X tier 10 medium
for the t30, players who own it gets the t110e5 for free and a complimentary t30 tier 9 TD as well. As for the Action X, players who own the fv4202 gets the new tank for free while the fv4202 gets dropped down to being a tier 8 premium. Dont really remember whether they get the FV for free or they have to grind it in a marathon mission.