With no major problems found in 5.0, the RC is now the final release. 4.0.3 is also released as a security and stability update only, with issue 63 also repaired, which marks the end of TenFourFox 4.
The next "beta train" for Firefox 6 leaves in two weeks. I'm in the process of moving to a new house, so this gives me a bit of a break before having to work on it. A "release pack" will be available with 5.0 changesets to apply to mozilla-release as soon as that repo stabilizes.
Unfortunately, Tobias' testing showed that tree vectorization didn't help much with gcc 4, which is still our baseline compiler. We'll look at this again when we consider jumping to 4.2 or 4.6. There are some other smaller things I'm considering for 6.0 that I can complete in the timeframe available. More on that later.