MyEclipse 10.5 includes Spring 3.1 containers. You can get this update from within your software and workspace center (the update is available for both MyEclipse and MyEclipse for Spring users).
Once you take this update, you can go to project properties > Java Build Path and on the Libraries tab, select and remove the Spring 3.0.5 containers (or JARs if you had chosen to copy them into your project). You can then choose the “Add Library” button, followed by “MyEclipse Libraries” and then choose the Spring 3.1 containers you require for your project. Prior to 10.5, you would need to create User libraries for the JARs or simply dump them raw on the project’s classpath.
mrum, could you give us an idea of how you would like this to work? Are you thinking about a context menu type action or an upgrade wizard that will do this for you?