Today we got a report from looneytooneyfanpl that the English audio was replaced by Russian during some shows. The logical conclusion was that they are testing for a possible launch of a Russian feed. I've checked out some Russian forums and it turns out that in Russia they already started showing some shows with Russian audio on 4. July. So far only certain shows have Russian audio while others are still in English but it is expected that by autumn all shows will be in Russian. That means that Boomerang CEE now broadcasts in 5 languages: Polish, Hungarian, Romanian, Russian and English.
Here's a video of Russian dub during Cartoonito show Ha Ha Haires, made by looneytooneyfanpl