Nothing is going to replace your BT3 disc anytime soon.
BT has an entire team of full-time people, support, funding, and is on it’s third release.
nUbuntu is just getting back off of the ground, and had ~5 people working on an Alpha build.
I encourage you to join the forum, and report back on your experiences – helping to improve the distro for a more permanent release.
Any and all feedback is greatly appreciated, especially in the areas of wireless compatibility, and program functionality.
–Chris