I do a lot of online shopping. And many times I have seen cortana reading those email and reminding me about the product’s arrival. While Cortana managed to remind me from mails I received but it could not automatically remind me of my commitments that I have written in mails. But with upcoming changes now Cortana would be able to remind you of your promises automatically.
Suppose, you mailed your boss about a presentation that you are going to do next week. Cortana will automatically remind you of the presentation with this new feature and if you want then you can also disable it. This feature is called Suggested Reminders and it is achieved by using Microsoft Research’s machine learning technology.
You can read about it more at Microsoft.