This email was from the devs not sony,we don't know what is happening.It could be many things,it could be that the early start is on na servers only but available to all regions .Or sony is not ready to releases packs on the 6th or even the 10th for eu ps4.But haven't seen anything official from ps4.
Also no dev answer actually change anything. So you are pretty good with just wait until Friday and see what happens.
And you've forgot the possibility you could buy founders pack but not ultimate, like it's not on Steam for whatever reason (probably because it contains ingame currency)
FYI the Founders Pack is on the EU PlayStation store now. I found it by searching Defiance 2050. In the description it clearly states "3-day Head Start". The pack is currently not for sale, but states "Coming 06.07.2018".
Let's wait and see!
Also i did not see the small bundles,only the ultimate for the 6th and the free to play download on the 10th.
people are jumping from one strange conclusion to another. What's wrong with the simplest version that actually is coherent with all provided info so far? :P