Redwood's Q3Atest Preview is online, offering some hands-on feedback about playing a very recent build of the test release. The write-up offers the news that id will be putting out revisions of the test. According to Red, "The first version won't have any bots but by ship time it will likely have bots and be more like a demo than a test." Here's another quote that talks about what weapons and levels are likely to be included in the test release:

Some of the items that will definitely be in the test are the chainsaw, machine gun, shotgun, plasma gun, and rocket launcher. There is a possibility of a railgun getting in there if one of the levels they are considering goes into the test. The one being looked at is a fun level that is a newer play style than most are used to. I don't want to spoil it so that's all I'll say. They said there will be more than one level in the test. I'm guessing that means two but a max of 3 could happen. I am really happy about their being more than one level since I imagine we'd get sick of that one level by ship time. :) The machine gun and plasma gun are perfect and I don't think any of us would change anything about them. The plasma gun had changed slightly since I was last there. Even though I had a blast playing and there were quite a few things that were perfect, doesn't mean we didn't have quite a number of suggestions. We are picky types though. :)