It seems Catalyst is already in the classroom and generating reviews on iTunes. Oddly, the review below only appears on the American iTunes gateway, not the Canadian, Australian or UK sites.
Here’s what one ESL professional from the States had to say:
A Valuable Resource for ESL/EFL Teachers
In Catalyst, an experienced ESL/EFL teacher shares a wealth of useful, practical, and, most of all, exceedingly helpful activities to engage students in learning English. As an experienced ESL/EFL teacher myself (20 years experience in Japan and the US) with a graduate degree in TESOL, I have personally used this material in my own classes and know that it not only works, but that students enjoy the tasks and activities immensely. It makes my job a lot easier when I can turn to a resource for creative and workable solutions to any classroom or instructional dilemma. Vastly better than the garbage produced by the major publishers at a fraction of the cost. I highly recommend Catalyst.