just2good has more information about the Summer 2015 sets, the information was provided by eurobricks member 'demitri'. These sets will be introducing the second part of the Elves theme which includes a castle! The Friends theme will be introducing a new sub-theme called "Friends Pop Star." And the brand new Duplo Disney sets inspired by the Popular TV show Doc McStuffins. But keep in mind this is just the beginning, I am almost 100% sure that there will be more sets added to this list over time so just stay tuned for upcoming news.
Creator Sets
31037 Adventure Vehicles
31038 Changing Seasons [building]
31039 Blue Power JetElves
41077 Aira's Pegasus Sleigh
41078 Skyra's Mysterious Sky Castle
Friends
41098 Emma's Tourist Kiosk
41099 Heartlake Skate Park
41100 Heartlake Private Jet
41101 Heartlake Grand Hotel
'Friends Pop Star' sub-theme
41103 Pop Star Recording Studio
41104 Pop Star Dressing Room
41105 Pop Star Show Stage
41106 Pop Star Tour Bus
Duplo Disney
10597 Mickey & Minnie Birthday Parade
10605 Doc McStuffins Rosie the Ambulance
10606 Doc McStuffins Backyard Clinic
So that is it my friends there are no pictures available yet. I am so excited for these sets to come out Creator and Elves sets. Which is your favorite??