Today, June 1st, is Sandbox day on the Mac App Store. After this point, all new submissions to the store must implement sandboxing, and updates to non-sandboxed software already available on the store must either implement sandboxing, or include only bugfixes.
Mi-Fi Monitor 1.4 is waiting for approval in both app stores. The primary change on Mac is the ability to selectively enable the signal, battery, or both icons in the menu bar. New icons are also included, I got feedback from more than one person that the old ones were too big so I started from scratch and made Mi-Fi Monitor draw them on-the-fly in code (using bezier paths and a ton of math :)
Today the Mac version of Mi-Fi Monitor was approved and released for sale on the App Store.