Definitely interested. I've been following the news and I'm working on creating a website/blog to cover Linux-based phones (mostly Ubuntu right now).
I think they are taking the right approach with regards to creating a unified platform that works on both mobile and desktop, but I doubt the first iteration will get it exactly right. Microsoft has a common kernel and UI design approach for desktop and mobile, but they are still at least a year or a few years away from a single OS running on everything. Apple is even further away, and Android needs more features and better better multitasking baked into AOSP before it becomes a good option for desktop/laptop use.
Phones and tablets (and further out: scrolls) are the future, but professionals and power users still need desktops and laptops for at least a decade. You can just get more "horsepower" for content creation like video editing, 3D modeling, or for high-end gaming in a larger chassis than you can in a tablet or phone.
I'm not sure that Unity is the best solution long-term, but I do want to get my hands on the Edge. I had a Nokia Internet Tablet, the 770, which had Maemo (based on Debian) and came out 2 years before the iPhone, and 5 years before the iPad. Loved the concept; imagine what could have been if it had greater development and a multi-touch capacitive screen.