Matt,
Excellent question. First let me address the "Existing Maven Project" issue, yes that will be addressed in MyEclipse 7.0
We apologize for the inconvenience, but for something as big and far-reaching as integrated Maven support in the
IDE, we had to roll it out in stages; MyEclipse 6.5 was Stage 1, MyEclipse 7.0 will be Stage 2.
As far as reading libraries from the build path and migrating them into the pom automatically, not likely right away, but at some point.
You can always right-click on your project and easily enough go down to MyEclipse > Add Maven Dependency and just type in the libs you need and those are added to your pom for you, but we don't do it automatically yet (there are things like bounded constraints that we don't want to automate because it can introduce bugs and folks won't know why they are occurring if some library has a change that is no longer compatible with their app).