have some good news to give from Ectar (EU EN Community Manager):

"Over the past few weeks, the “Unsportsmanlike Conduct” player report category has been a hot topic. We’ve received a lot of feedback from your forum posts, tickets to Support, posts on WoTLabs, Reddit and other places online. Thanks! Your feedback has really helped highlight this concern. We’ve been working alongside our Customer Support team to gather this feedback and see how we could improve this system.

During our investigations we have identified key areas where we agree a different approach is required:

The current in-game report system is not as effective as we’d like it to be in order to report genuine in-game misconduct, such as: pushing allies out of cover, blocking team mates, or revealing team mate positions or any other abuse not covered by the other categories.
The way Unsportsmanlike Conduct reports have been handled on the EU server has encouraged some players or groups of players to try and manipulate this category in order to get other players unfairly sanctioned.

As an immediate result, we have put in place several changes regarding how sanctions for Unsportsmanlike Conduct are handled and given out on the EU server. We’re also continuously discussing options and possibilities to improve our current in-game report functions for our developers to review.

Please note it is very important that you all still continue to use the in-game report function to report any kind of misbehaviour you witness in battle, as we rely heavily on these reports to adjust our actions according to the offence.

The voice of the community has helped to shape this process, so we would like to once again thank all players for their feedback and patience during this review, and especially for all the great ideas and suggestions."

He doesn't say what was changed, I will ask when possible, its closed time for the Paris office.