The 20th has just one book The Reformed Vampire Support Group, by Catherine Jenks. Booklist described the cast of characters as "barely likable whiners and pathetic hand-wringers" but went on to praise the book's humor. I myself don't mind whining, but I do prefer likable whiners (my children come to mind)...so I might pass for the moment on this one (but see the enthusiastic recommendation in the comments).
The 21st, on the other hand, brings with it several books:
Bad Girls Don't Die, by Katie Alender. A spooky sounding story of ghostly possession--I want it!
Warriors: Power of Three #6: Sunrise, by Erin Hunter
Vampire Kisses: The Beginning, by Ellen Schreiber
And then, of course, there's Fragile Eternity (Wicked Lovely), by Melissa Marr. Many of us are looking forward to this. But did you know that she has begun a new series of graphic novels, set in the same universe, also releasing today?
Wicked Lovely: Desert Tales, Volume 1: Sanctuary, by Melissa Marr, illustrated by the Xian Nu Studio. From the Amazon blurb:
"The desert is far away from the schemes of the Faerie Courts—and that's how Rika likes it. Once a mortal and now a faery, Rika seeks isolation and revels in her ability to appear invisible to humans. Then, she meets him. Artistic and kind, Jayce is the last person Rika wants to hide from.
But change is coming, challenging Rika's freedom and her new romance, as her past pursues her, even into the heart of the desert. . . ."