I too would welcome any detailed information - preferably sooner rather than later - though the only things that are obscure are the quartets of what are presumably measurements - TITLE, MARGIN, ITEMRECT, IMAGE, TEXT - and MAX-PER-PAGE and ITEMSPACE.
The user's guide just says to copy an existing one and modify it. But not all of the available tags are in all of the files. So to get an idea of what is really possible you need to go through all of the existing themes. A simple guide would be helpful.
Also I would like to know what SoFo is going to do in the area in the future. Are they going to sell additional theme packs? Are they going to set up a user swap site? Are manuals and tutorials for themes going to be available. I'm just wondering what the game plan is.