Games will get their own subforums as we get closer to the release date. We're not sure what the time-table is with the new forum, so it's kind of up in the air whether this forum will see it or the new forum at bethesda.net - but this is pretty standard.
Unfortunately, it's my experience that the existence of a "spoilers" forum doesn't always cut down that much on spoilers in the main forum. The sort of person that won't bother with spoiler tags or looking to see if there's already an existing thread is also the sort of person that won't post their thread in a spoiler forum. So even with sub-forums, it tends to be common for a lot of threads like that to pop up - we'll try to respond to those as quick as we can, but the reality is that it's going to happen one way or another.