This is great! However, it's time to start thinking about applications depending on latest CSSU. Right now, you won't be able to promote this package to Extras, and that rule should be overridden.
One remark and one question Question: Is it my imagination, or could I zoom with the volume buttons in the previous version? Maybe I am mistaken and it was never there... Edit: it was for turning pages. New method is even better.
Remark: Could you add an icon to the latest installable deb file? It is missing now.
Might be a silly comment, but: why is the japanese set in a serif font when the regular name set in sans-serif on the splash harmattan splash screen? lol