Unless the assistant coach is going to be Wayne Bennett then I can't see an assistant coach announcement being classed as huge news. If it is then the marketing team at the Bulls deserve a swift kick up the ar5e.
Rule 1. Reserve huge news announcement for huge news only or you'll have a lot of disappointed fans to deal with.
Huge news to me is either a stadium development announcement, a financial partner coming on board with the means to take the club forward, a massive sponsorship deal or signing star players. I wouldnt class anything else as huge (apart from the wifes bum bum).