The next update thread has a link back to the previous week's thread. Since that hasn't been published yet, it doesn't exist yet.
Additionally, the thread is linked as normal as other forum threads are ... linked from the home page when it is at top of the forum and from the forum category page. Search engines take time to index new pages/links. Its only been a week. If you are interested, maybe research back the previous weeks/months and see the difference. I'm not sure, as I haven't.... yet.
I think it is structured correctly, but your comment did make me consider how we link to this within the newsletter/search engine guide. With that we never link to this thread, but instead include the individual links. That may be changing soon based on your comment, but overall I think all ok.