Quoting from this thread:
„I have moved off of World of Tanks. They are still determining what to do with tournaments in the future. So yes, after tomorrow, there are no planned tournaments except for the Absolute Clan Cup. If that changes, it should be announced on the forums and/or portal.”
Also:
„There are no more tournaments for the foreseeable future, while those still working on WoT figure out what they want to do.”
„NA tournaments are run by NA staff. So me leaving for another product won’t affect the other regions” (Source)