I don't think too many people are going to get enthusiastic about packaging it until it nears its release. That's still the best part of a month away. All the llvm ppas
In the meanwhile, you might be able to just pull in the
llvm-2.8 packages from Maverick. I say "might" because it just doesn't work all the time. Sometimes the dependencies run too deep and you end up pulling in so much of Maverick things become unstable.
Otherwise you're left with compiling it yourself. That should be well within your abilities but generally speaking, this could upset anything that depends on
llvm. I think as it is, nothing in Lucid depends on
llvm (it's not installed here) so you might be fine.
If you are going to compile, the Getting Started with the LLVM System is going to be your main reference for the next few hours.
Another option is developing against Lucid's 2.7 and testing on a Maverick install. The most convenient way for a sole-developer would be through a virtual machine (ie VirtualBox). This is extra-handy as you'll be in a good position to file bugs where they need filing so you're not left with a buggy environment when you do upgrade your dev machine to Maverick.