Hi Kristo. Nice to see you stick around ages after your initial involvement with Buschel's codec
1. SV8 files work very well with at least one player (no names to give)
2. The SVN code is the latest and safest to use
3. There will be an official release when we bang our heads together with the main dev, testing every byte of the code, until there is absolutely no sign of nasty bugs. We've added one feature lately and it needs to work perfectly before we release anything 'official'. An encoder made from the SVN sources will probably create files that are official SV8 files, but I don't advise to take such a gamble

4. Come by our IRC channel again. You're welcome to help test too