Yes, they (usually) do — but which one? And this is what I want to write about.
Ubuntu 10.10 ‘maverick’ got released week ago. I was using it since UDS-M — especially on my laptop as 2.6.34 kernel worked better on it. Some developers told me that they do not touch it before first Alpha release, others wait for Beta releases even. Fun was with one friend who installed Maverick on his laptop and found that touchpad is not working any more (worked in Lucid)… But it was at RC phase so nearly nothing could be done…
Now Natty development started. Both my x86-64 machines runs kernels from it, laptop is fully upgraded, desktop uses newer toolchain packages (will upgrade soon). But those are mine computers and I used Debian “sid” since it was created…