There are multitude of pages / articles / blog posts / live sessions, produced by either Adobe internals, or recognized partners available publicly .
See the list below to gather additional knowledge on how to extend and customize the AEM Touch-optimized UI authoring .
Join Sreekanth Choudry Nalabotu and Scott Macdonald for a discussion about creating AEM Touch UI components . You will learn how to create touch UI components, create dialogs and use Touch UI based APIs meant for component development. By attending this session, you will gain a deeper understanding of developing AEM Touch UI components.
Extending the User Interface of Adobe Experience Manager : http://blogs.adobe.com/experiencedelivers/experience-management/extending-user-interface-adobe-experience-manager/
User Interface Customization in AEM 6.1 : http://www.slideshare.net/martinischeery/aem-61-user-interface-customisation
Evolve presentation "Why did Adobe create a new UI in AEM 6.0" : http://www.slideshare.net/GillesKnobloch/2014-1118touch-uibusiness
Blog of Damien Antipa, AEM Sites Senior developer : http://damien.antipa.at/
Blog of Sreekanth Choudry Nalabotu, Technical Architect : http://experience-aem.blogspot.it/2013/08/in-blog-experiencing-adobe-experience.html .
Adobe Marketing Cloud hosts on github SDKs, samples and tools contributed by Adobe engineering and the whole developer community.
The following queries are examples on how to retrieve the repositories related to Touch-optimized UI :