Nowadays, to design innovative and multidisciplinary products such as mechatronics systems, product development process needs to be rethought or at least adapted. These current processes are based on organizational models, business standards IT solutions, etc. They must consider that electronics and software represent an ever-increasing part of the final product. In this context, traditional mechanical engineering, electrical/electronic, and software methods cannot just be coordinated, and common interdisciplinary design approaches have to be proposed. In this chapter, we will explore current mechatronic systems design processes and present the work of convergence and synergy between mechanical, electronic, and software design processes, particularly with the use of system engineering and model-based system engineering but also with the growing integration of IoT and related data. Then we will explore new trends in mechatronic systems design, by focusing on the integration of sustainability aspects at the mechanical, energy, and software levels, the management of the obsolescence of components and software in mechatronic systems, and the application of AI to use data from mechatronic systems to generate new sources of value. We will conclude this work by exploring the possible links between these different trends and how they can complement and feed each other.