So maintenance is finished, patch notes here: http://armorblitz.com/2017/10/oct-25...-of-halloween/

Cleared tile 3 on both paths without loosing a single tank; here's some changes that i noticed:

-tile 2 boss is now crystal (before it was something like tile 1 boss);
-tile 3 on haunted (spirit) path has no middle pumpkin turret;
-tile 3 maps don't spawn mouse, reavers and some other 5* like GW Tirer, S-51, FV, Sturmtiger;

event tanks still spawning.