The new source for WOT notes posted some information on 9.8. I can't put the posts in here because I can't get the her site from work.
What I remember. Some 9.6 and 9.7 bugs won't be fixed until 9.8. No buff to IS-4 (I have one it needs more armour). Some WIU are minor buffs to some tanks. Two are being nerfed. IIRC nothing on Super pershing, Chieftain, T10 Cent and VK 45B.