Pay rate changes would depend on your employer. Some will see it as an improvement and give you a raise (again, the amount would be employer-specific) while others will not give you a raise and simply congratulate you. Going to another employer, specifically one that needs personnel trained in those areas will most likely see a pay rate and hiring advantage because you not only have the experience, you have the certification to show that you know what you are doing.
Most likely, leadership roles are going to be changed so that they require advanced training and certification. Getting it in ahead of the changes will help show your commitment to constantly trying to improve your knowledge and keep both yourself and your patients safer. You certainly do not want to be in a leadership role when/if a change in requirements comes down and not have the additional training. Depending on your employer, there might be no window, a small window, or a large window of time to get the required training, and if that is not achieved, you most likely would be demoted or even possibly let go entirely.
Of course, if your company is unionized, there may be additional rules that either help or hinder changes in payment rate.
The best thing you can do is ask your HR representative/hiring supervisor and see what they say. As these certifications are still new, there may not be anything in place yet but there could be in the future.
As others have already mentioned, I too will be advancing for my own satisfaction. It's been a little over two years since I was actively working in a pharmacy and I have kept up my licenses and certification because they are something to be proud of.