xMII v12 Release Date and Recommendation to Upgrade

We're running 11.5.3 and don't have anything in production yet but are within a month of delivering a set of key metrics to one of our plants.

Would you recommend we upgrade to v12 before we go live with this first project? (If we told the plant it would be a couple of months I don't think they'd mind and my feeling is the longer we wait to upgrade, the more effort it will be.) The last I saw regarding a v12 release date was in a post dated 10/19/07 - it mentioned 11/30/07. Is it available now?