In a previous post from June of 2022 I listed some of the version release dates.
In the same Panorama Journal dated Summer 1994 there was a notice of a minor update to version 2.1.3. The journal also mentioned that a new PowerPC version was in the works with a tentative release date in the first half of 1995. My old Panorama 3 Real World Programming book has a copyright date of February 1996. I also have an early beta hand made mock up CD of Panorama 4.0 that Jim sent me in 2001. He jokingly wrote “Perhaps someday the enclosed package will be a collector’s item - we can always hope!”.