Here it is:

-9.7 test will start later today;
-9.7 will bring the IS-3 in HD after all;
-The changes in BigWorld in 9.7 are mostly internal, they won't be noticed by players apart from perhaps some small performance improvement;
-More big news for World of Tanks will be announced after 9.7 comes live;
-The Overlord map is very historical, the mapmakers made a trip to Normandy to study the architecture and environment there in details;
-It's possible that 0.9.7 will bring some buffs and some nerfs;
-The option for players to select which map they want to play in random battles will not be implemented (RG: should be more select the ones we don't want, map rotation tends to give a overdose of the same maps way too frequently).