I finally made the effort to learn Maven Tycho. It is really a pleasure compared with PDE Build. I also created a small Maven Tycho Tutorial.
Currently it only covers the creation of plug-ins, features and p2 updates but I plan to add a chapter about Eclipse 4 product builds soon.
Thanks to Xavier Seignard for his help on Twitter for uploading only the p2 update site with the Maven Wagon plug-in.