@Ali Reusing the admin interface of Wordpress makes sense 
The main thing there, to make sure we do carefully weight the need to push something to the whole community this way, would be to not make it too easy or systematic.
For example, if we just add an extra field for every blog post form, then we will encourage pushing the news for every blog post, even if that field is optional and leaving it blank doesn’t push the news to students/instructions. Having a completely separate category, with the need to create a new post for each news update, would make us think twice every time?
As an instructor, I never visit the Studio home page, I always go straight to my bookmark of the course’s home in Studio, or access it through the a direct link from the LMS. The only time I would go there is if I need to create a new course.
Imho adding a little bell in a corner isn’t bothersome, especially for something as important as giving visibility to the Open edX project to its community of users? If it takes too much real estate, it could only be shown when there is new news, but imho it could likely be made unobstrusive. The bell/icon doesn’t need to be a big flashy button, only the unread flag needs to be flashy - and as noted the goal is to use it with parsimony. But when we will use it, we do want to attract all users’ attention to it - that’s the whole point of the change?