the next Top of the Tree (tier 10 discount) on EU server will be the STB-1.
Other vehicles of the branch on discount are:
50% discount on purchase:
30% discount on purchase:
- Type 61
+ 50% Crew XP bonus for all vehicles included in the special.
These bonuses will be available from 15 June at 07:10 until 1 July at 07:00 CEST (UTC+2).
They also included a STB-1 vehicle overview if you feel interested: http://worldoftanks.eu/en/news/pc-browser/44/top-tree-stb1-2015/