Vehicles that'll likely get buffed:

Bat Chat 25 t (Out of the meta for a while, so it makes sense)
B1 (One of the worst-performing Tier 4 tanks)
IS-3 (Still a good tank, but it's good to see an OG tank get some love)
110 (One of the worst-performing Tier 8 tanks)
M46 Patton (Out of the meta for a while. Considering WG reworked the Tier 9 AND 10 of certain tech trees, it's possible that the M48A5 will be buffed as well)
Panther (It could be the Panther II or another German medium, idk. However, it'll make sense for them to rebalance tanks in the same tech tree, especially the Panther II since it hasn't been performing so well lately)
Type 4/Type 5 Heavy (As mentioned with the M46 Patton, it's likely that both the Type 4 and 5 will be buffed together. On top of that, these vehicles desperately need the buffs)
Object 430 II (Garbage Tier 9 medium, makes absolute sense)
WZ-132-1 (Same case with the Obj 430 II)
T-54 (Maybe? It'll probably get minor buffs considering it's not a bad tank by any means. Judging by WG's tendency to balance the Tier 9s and 10s of respective trees, the Obj 140 might get some love as well, though it's perfectly fine without any)

Vehicles that'll likely get nerfed:

E 50 (One of the best-performing Tier 9 mediums, however, I hope they don't over-nerf it considering it's not necessarily OP. There is also a chance the E 50 M will be nerfed too (God forbid). On the other hand, they might straight up buff them, who knows)