The only thing that will prevent the release of MacJournal 2.6 next week will be my untimely death.
After that will come MacJournal 2.7. I decided that there were enough features that could be implemented rather quickly given the work that went into 2.6 to justify a quick 2.7 release. 2.7 will likely still support Jaguar (although the minimum may be 10.2.8 vs. 2.6's 10.2). 3.0 will not support Jaguar.