The truth is that anyone can sue anyone else for anything. Whether they can prevail or not is a different story.
A class action suit requires a Fed Court to grant that status and it is difficult to get that status. And, it requires an apriori showing a law has been broken.
When you write, "the performance review bonuses" if you mean the latest fiasco where they were simply incorrectly calculated then there is no case. You can't make a case for bad, inept or even vindictive business practices. They have to break an employment law and I can find nothing in these actions to warrant a court to find that there is any reason for a suit.
So, dream on.