It looks like Jiri is trying to limit the damage:
The Ultimate edition includes mainly "premium" features compared to Professional. You don't need them: 100 extra tree icons, spellchecker, two-line displaying of tasks, etc. Even in the future, the Ultimate-only features will be mainly features like this, eye-candy, etc. Everything truly important is in Professional - and always will."
However, I'm pretty sure that earlier (not running back to check) he said that new development, new features, would be mostly Premium.
Giving him the benefit of the doubt, we can say that he realizes that some of his user base is not happy with the way the 3-tier is implemented, and is awkwardly trying to limit the damage.
The irony here is that Dextronet could easily raise revenue by normal "new releases", since they are not in a "lifetime" type of model. And satisfied users would gladly pay, I believe, a $25 upgrade fee if there was real new value, every 12-24 months. So he did not have to try for the gold with the premium, which only works to demean a moderately pricey pro license.
On top of that Jiri is planning some type of sync-server thing which is supposed to be subscription. So the whole thing was quite unnecessary. Any ultimate edition (as Tomos points out) should have involved network, server, enterprise and/or sync, encryption, maybe fancy import-export, not basic functions (spell-check, calendar) or eye-candy.