The stuff on the filing of formal charges is new. The (literal) date-stamp on the indictment is from Thursday: https://assets.bwbx.io/documents/users/iqjWHBFdfxIU/rIz2tT7h...
Since there's some redaction (and the flurry of posts on this exact same topic), I'm guessing it took until today for them to be publicly released.
Another thing that's new (to me at least) is that they indicted Huawei itself, not just Mrs. Meng. A lot of the previous reporting that I read focused on her actions exclusively (probably due to extradition hearing).
The significance is that before they formally charge her, there is room for face saving maneuvers. For example the US could have agreed to press lesser charges as a result of a backroom deal with China. After this new development, that is not an option for the US.