Is there at least anything other than Vogella\'s tutorials and his book, which is completely based on those tuts? Examples from his repo are often either incomp
Lars Vogel's Tutorials are the most complete and up-to-date documentation on Eclipse 4 development. Second to this is asking questions in Eclipse 4 Community Forum. Last option is to google for specific technical problems, which will in most cases lead you to blog posts from the same people that are active on the forums. (Mainly single supporters like Lars, some Eclipse devs and the guys from www.eclipsesource.com)
I discourage using the wiki, since much of the information may be outdated and may be more confusing than an actual help. Documentation for JFace and SWT can be reused from Eclipse 3.x since there are few to none changes in Eclipse E4.