Refer to the release notes for more details. – https://github.com/cucumber/cucumber-jvm/blob/master/CHANGELOG.md.
There has been substantial changes in cucumber 2. Refer to this for more – https://cucumber.io/blog/2017/08/29/announcing-cucumber-jvm-2-0-0
io.cucumber and info.cukes are Maven group ids. info.cukes was for Cucumber version till 1.2.5. The latest version are in io.cucumber starting from 2.0.0. There is also a new version 3 with more goodies in github with the master as mentioned in the release notes.
The reason the groupid was changed because gherkin has changed the groupid similarly.
cucumber-jvm is the java implementation of Cucumber framework. there are many other implementations in other languages – https://github.com/cucumber.
When you use the @RunWith(Cucumber.class) on top of the test class, it means that a specialized runner is being used which will execute the feature files. The default runner of junit will not get you anywhere, though might cough up some exceptions.