Hi Alfresco,
As I've played with preview 1, one of the things I have thought about many times is the ease of use in editing the XML. I have a wide variety of XML doc types; some are reasonably small and have fields for HTML editing (perhaps xs:anyType fields that can contain nested XHTML), some that have moderately complex structures for individual elements which may repeat many dozens of times. The XForms/TinyMCE editor as I've experienced it gives very limited or no options to collapse an element, or to page through a set of many elements to find the one that needs an edit.
What do you envision changing in the interface? I've tinkered with MyEclipse's XML editor, OxygenXML, and others, and it seems no one has yet come up with a great editing experience (or set of experiences, since different data definitions might warrant different approaches), even leaving off the enabling WYSIWYG XHTML.
Looking forward to beta!
Dennis