It is well known that Prince recent resurgence, from 2004 onwards, and starting with the Musicology tour, is closely linked to the decision of Prince of working with AEG, one of the two big enterprises involved in organizing live tours of big stars. This strategic move of Prince has worked wonders, leading to big hits like the above mentioned Musicology US tour, or the 21 nights in London.
Now, when I was digging about the details of the recently announced live appearances of Prince in European festivals, it happens that all of them are related to AEG's main competitor, Live Nation. I am not sure yet if the organization of all of these festivals is directly managed by Live Nation, but regarding tickets, it is clear that Live Nation is selling those tickets, and two of them (Arras Festival and Werchter Boutique Festival) are Live Nation events.
Besides, I found some days ago that Live Nation has a page, in their website, devoted to Prince tickets:
But then again, still today, you can see a certain purple musician prominently displayed in the page of AEG:
All in all, this is quite confusing and I have no clear picture to offer yet; but in my opinion, this information suggest that Prince might be about to switch (or maybe it's something already done) from AEG to Live Nation, regarding the organization & management of live appearances.
Whether this is good or bad news for fans of Prince music, I don't know, but it's quite interesting, in the light of the many recent news suggesting that Prince is in strong need of cash.
By the way, if you need to contact me in private, please send an email to firstname.lastname@example.org