Some improvements for mobile editing are included in 5.7.4. However, some issues are still existing. I'd like to know whether these issues will be fixed by core team or not.

This is the list that I think.

Issues for small devices

* Can't add a new page
* Composer link is bit deep (under the Dashboard link)
* Can't click an area tab (so can't open an area menu)
* New help system do not support small devices
* Can't use page attributes panel
* Can't access to child pages in dashboard
* Can't logout
http://www.concrete5.org/developers/bugs/5-7-3-1/logout-on-mobile-d...

Issues for tablet devices

* Can't drag block type dragger (but can open the add block panel)
* Can't click an area tab (so can't open an area menu)
* Can't open the drop down menu of Elemental theme
http://www.concrete5.org/community/forums/5-7-discussion/elemental-...