Builds/installs fairly painlessly on Oneiric 64-bit.
I'm excited for some of the changes/features I see:
Finer-grained control over Tidy
The ability to quickly link stylesheets
Quickly build an inline TOC from headings (although I personally don't care to use html lists for this, it will still be useful to get the bulk of the heavy-lifting done quickly... and regex can always take care of the personalizing).
Can't wait to play a bit more.
EDIT: A quick note on the Build In-line Toc feature. I don't know if this is expected behavior or not, but when I use it on an epub that has an existing toc.xhtml file, the newly generated code replaces the existing code in that file. Not very surprising, really. What
is a bit surprising is that there's no visual indication (asterisk in the title-bar) that the ePub has any unsaved changes afterward... and when Sigil is closed, there is no prompt/warning to save/discard the changes (which are, in fact, gone when you reopen the ePub).