Lemurian Dreams, launching on August 1st, will be a bimonthy fantasy fiction magazine aimed square at D&D readers. As well as the stories themselves, it will contain notes to enable the stories to be easily used in a campaign.
Royal Griffon, launching on November 1st, is essentially a module with a magazine wrapped around it. We take a full-length module (Issue 1's is being written by Jeffrey Quinn) and wrap a magazine around it - a couple of short site-based adventures, and a couple of articles reinforcing the main module.
Concept Horizons, launching on September 1st, will basically be covering D20 Modern. It will be monthly, and will cost only $1.50 (but will be shorter).
As for Almanac, it was designed as a basic D&D magazine, covering the whole spectrum. Each issue has a specific theme (Issue 1 was 'Dungeons', Issue 2 is 'The Apocalypse', Issue 3 is 'War', and so on...) The magazine is designed around ideas rather than rules - rules are available in spades on the net, but idea pieces seem to be harder to come by.