What is coming after agile?

@Sergio. Thanks for your information. I´m nearly new to agile and I used this guide as a first reference because it has a hybrid approach which is my current situation.

Any recommendation to read about it?

Thanks!

No problem. In fact, in my actual work place, I am in charge to define process and methods and we have defined our own hybrid method too.
The important thing is the definition of Agile. With that on hand, my recommendation is take a closer look to your organization actual situation analyzing the whole enterprise architecture. With a simple piece of paper is enough,
Then, if you have found what you need inside the PMI´s Agile Practice Guide then go ahead.
If you are creating software products then the "bible" is the Manifesto.
I should said that Agile could be divided into two different worlds: Agile as it was born (enterprise wide) and Agile as it was best implemented or researched (software domain). About Agile as it was born search for Rick Dove´s book "Response Ability". About application of project management in Agile environments here comes my recommendation (I worked with the authors of the books then I lived what they wrote, including using it for non-software products):
-Agile Project Management, Jim Highsmith
-Agile Estimating and Planning, Mike Cohn
-Organizational Patterns for Agile Software Development, Jim Coplien
-Essential Scrum, Kenny Rubin, mainly if you will use Scrum