Deception's Princess - Esther Friesner (new book in her Princesses of Myth themed set)
Midnight Crossed - Charlaine Harris (new series)
Blood Red (Elemental Masters) - Mercedes Lackey Sure, I didn't like the last one. But hope springs eternal.
Shiver of Light (Merry Gentry) - Laurel K. Hamilton Maaaaaaybeeee...
Cast in Flame (Chronicles of Elantra) - Michele Sagara
Magic Breaks (Kate Daniels) - Ilona Andrews
Shifting Shadows (Mercedes Thompson short stories) - Patricia Briggs
The Winter Long (October Daye) - Seanan McGuire
Shattered Shields anthology - edited by Jennifer Brozek (has a McGuire short in it)
Madness in Solidar (Imager Universe, new series) - L.E. Modesitt, Jr.
Pocket Apocalypse (InCryptid #4) - Seanan McGuire
Chaos Choreography (InCryptid #5) - Seanan McGuire
No Set Date
The Future Falls (Enchantment Emporium) - Tanya Huff
Magic City (anthology) - Patricia Briggs, ed.
Magic for Nothing (InCryptid #6) - Seanan McGuire
Tricks for Free (InCryptid #7) - Seanan McGuire
Things that matter for other people:
May 20 - Cyador's Heirs (Saga of Recluse) - L.E. Modessit Jr.
May 27 - Skin Game (Dresden Files) - Jim Butcher
Nov 28 - Heritage of Cyador (Saga of Recluse) - L.E. Modesitt Jr.