Since there's no release announcement on http://release-blog.ubuntu.com http://release-blog.ubuntu.com or elsewhere, and the home page hasn't been updated, the

Since there's no release announcement on http://release-blog.ubuntu.com http://release-blog.ubuntu.com or elsewhere, and the home page hasn't been updated, the release isn't officially out. Release images are made available for the mirrors to sync a while before the actual release. Downloading them now will slow down the syncing, and people who download now will risk getting not-so-final and potentially broken images (it's happened in the past, can happen again). Which is why I'm flagging this for the time being.