mSecure development is going strong, and we plan to release version 6 as soon as possible, which is the reason there hasn't been any major type of update for some time. All of our development resources are being used to finish the new release.
For the very first release, we are planning to have family sharing implemented via Apple's App Store only, then as we continue to develop the cross-account sharing feature, there are plans to enhance it with more functionality and greater flexibility for larger families and teams. This is one of the features we're still pinning down as we get closer to the first beta release, so more details will be available as we continue the development.
The full details for the mSecure 6 pricing model have not been released, but I can tell you that licensed mSecure 5 users will not have to pay an upgrade fee to continue using all of the features in mSecure 5. On top of that, there will be upgrades that come for free to mSecure 5 users, but there will also be some premium features that will require a purchase to use.
In short, licensed mSecure 5 users will get an upgrade at no cost, but not all features will be available without an extra purchase. We plan to send out email communication to our customers as we get closer to the mSecure 6 release, and it will outline in detail what to expect for the new version.
That's great to hear Alastair! Our first beta release will be available very soon, so the v6 public release won't be far behind =)