Maven 2.x vs 3.x

Today I wanted to know what is difference between version of this tool. I didn't use Maven at advance level so for me it is only some change in pom file.

Anyway I find out:

1. I can run maven in multi thread mode and processor multicore mode.
2. I can use maven shell
3. It is a little faster then before but in my situation it doesn't matter.
4. Logs are more verbose

Other useful option:

1. I can convert pom file into some other JVM languages script like grove.

There are more changes but I'm not going into great details here.