An application that works on 1.0.2, should work on 2.0. If it doesn't then we'd love to hear about it so that we can, if possible, fix the problem.
The only thing to be aware of when moving from 1.0.2 to 2.0 is that, in the latest 2.0 nightly builds, support for Web Modules has been removed in favour of OSGi Web Container compatible WAR files and Web Bundles. If your 1.0.2 application contains a Web Module, rather than a WAR file, then the programmer guide that's packaged with the nightly builds contains details of the steps to take to perform the necessary migration.
Andy Wilkinson
SpringSource