This is the response I received from the Lumina people:
> I believe Lumina is essentially agnostic when it comes to platform hardware - there
are no plans to drop support for an i686 platform. Lumina is still intended to be very
system resource conscious and this will likely be even more true when Lumina 2.0 is
released.
>
> That being said, if you decide to incorporate or use Lumina with your project,
we're very open to integrating upstream any specific features or troubleshooting your
team may add. Just submit a pull request and we'll review and merge it as soon as
possible. :)