As always, this is more for myself than you.
Series with books out that I haven't read:
Adaption series by Malinda Lo (Inheritance and Natural Selection)
Time Quartet by Madeline L'Engle (half of Swiftly Tilting Planet, Many Waters,An Acceptable Time)
Scott Pilgrim by Bryan Lee O'Malley (3-6)
Miss Peregrine's Home by Ransom Riggs (Hollow City)
Shades of London by Maureen Johnson (The Madness Underneath, but waiting until the 3rd is closer)
Series that I'm waiting on the next book:
The Land of Stories by Chris Colfer (3rd is out July 8)
Lunar Chronicles (4th book out Feb 3, 2015)
Stephanie Perkin's tie-in series (Isla out August 14)
THE MOTHERFUCKING HOST SERIES BY STEPHANIE MEYER???
Scarlet series by AC Gaughen
Cormoran Strike series by JK Rowling
The Mortal Instruments by Cassandra Clare (possibly)
The Apprenticeship of Victor Frankenstein series by Kenneth Oppel