http://www.buffed.de/TESO-The-Elder-Scrolls-Online-PC-239823/News/The-Elder-Scrolls-Online-PvE-Raids-Mega-Server-in-Frankfurt-und-Infos-zur-Closed-Beta-und-zum-Launch-1071463/
The article is in German and I only know a little bit of it, but Buffed put up an article today talking about Raids and a few other topics. I came across this when reading the Tamriel Foundry Pre-E3 Coverage Roundup, http://tamrielfoundry.com/2013/05/pre-e3-coverage-roundup/
and saw the Buffed article. The interesting quote they took from there was this:
The bolded part really got my attention. As we have known for awhile now was that Adventure Zones = Large Group Encounters (Raids basically) and that AZs weren't going to be in the game at launch. But this Buffed article says otherwise and points out the Large Group content for PvE is suppose to be in at launch. Now I know Buffed isn't always the most reliable, but I thought I would share this little information and hope that means that Raids will be in at launch and we won't have to wait for a bit afterwards.