The book "Java EE 5 Architekturen" is available from amazon.de - so is really out now :-).
The p4j5 community is still growing. Only last week I approved 3 observers - now we are 22. I get many direct questions and suggestions (some really interesting) directly per email regarding patterns, and architectures - please use the p4j5 forum/mailinglist for discussion as well.
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
airhacks.fm the podcast:
Stay in touch: airhacks.news.