No it is not a rumor. The dev is working on it. dont know the release date though. Front page Post + Screenshots DOOM Classic Progress Report
Wrong forum? Where else would you post it? Seems to me the upcoming games forum is the perfect place. On-topic, and Carmack's update was a fascinating read. I like his commitment to the project, his understanding that it's a lot more serious a project than Wolfenstein was. I will buy this on release day, and it's really nice to know it might actually come out this month.