I've started to read the Vanilla covenant you wrote Timothy, and I think it is very good. Some good choices have been made, and they are explained well, for the flow of play. Many of the problems a spring covenant faces in a 'covenant-builders' themed saga are avoided by already being established. The well known solution 'the senior magi are too busy - deal with it yourselves' works to a certain degree and for a time. But eventually you can remove them from the sage in some way, then the players are ready. I like the point of the senior magi being partly run by the players otherwise playing junior magi, in order to try out more advanced magical feats etc. I had never even considered that.
Whether the line is winding around or sideways I don't know either. But let's not allow the name of the month dictate too much, I think it's never too late to collaborate on some project. Just as the line as announced ended there was a lot of buzz regarding collaborative writing and whether or not the Roman Tribunal book took off I can't say since I left the discussion early.
After finishing my last draft for the last ArM book I contributed to I've managed to finish some material for SubRosa which had been underway for quite some time. But now I'm ready to look into other things. I just don't have any good ideas. I might get some ideas about specific things once a concept has been invented.