Well, as some people speculated recently, Prince has announced what is his first proper tour in Europe since 2002 (previous shows in the 2000s were hardly tours: London was a 21 dates stay, and the rest were more or less one-off gigs).
Thus far, this is what is confirmed:
4 July, 2010: Denmark, Roskilde, Festivalpladsen (Orange stage)
5 July, 2010: Germany, Berlin, Waldbühne
9 July, 2010: France, Arras, Citadelle
10 July, 2010: Belgium, Werchter, Festival Park
12 July, 2010: Switzerland, Geneva, Stade de Genève
13 July, 2010 Austria, Linz, Linz Gugl Stadion
18 July, 2010: Portugal, Aldeia do Meco, Herdado do Cabeço da Flauta Meco, Palco Super Bock
Recent rumours suggest that we could see an addition to this list:
17 July, 2010: Spain, Benicassim, FIB Festival
Besides, there are other unconfirmed rumours indicating that Prince would appear at the final Johnathan Ross show in the UK, being recorded in June 17. If this gets confirmed, one could expect some show around that date in the UK.
But these are strictly rumours at this time, so hold your horses.