I've already unpublished my entire Catalyst and Great Death series as I undertake rewriting them. The complete rewrite of Catalyst is a long-term project, while the revision of the Great Death series is a simplification of the language to make it an easier and faster read. As such, I'm going to 'retire' the entire Great Death series, just as I did the earlier Catalyst books.
If you want to save them for posterity (or to compare what I do with them), grab them now, as they'll be unavailable soon.