This looks promising. The changes from v3 to v4 were mostly under the hood to make it faster and more accurate. These look like new features (to be revealed over the next couple of months).
You can register on their site to be notified when v5 launches.
I really like the direction Artlantis has been moving. They've added the ability to do linked panoramic renderings for presentation on computers and iPad (iVisit3d - iTunes App store link), added the Maxwell Render engine as an option, and now it looks like they have taken a myriad of user requests and are implementing them for version 5. I hope it really is a revolution as they claim and not just an evolution.