I'm not super sure what this image is showing. Are the red arrows showing production delays? (E.g. The production of the RF 100-400mm was supposed to start at the beginning of last year but has now begun about a month ago?)
Anyway, looking at the image, the green bars seem to start a couple of months before announcements happen. The 24-240's bar starts a month or two before its announcement, same with the 24-105, and the 600 and 800 started production about 5 months before their announcement.
Going off of that, it seems like the 18-45 and 100-400 could be announced any time now. They may be waiting to announce the 18-45 with a crop-sensor mirrorless camera, so maybe just the announcement of the 100-400 soon, which would fit with the recent rumour about the 70-400 and 16mm lenses. Really wish we knew where the 16 mm lens was.