Here are a few sequels that I wish were released ... maybe not now, but within the next month.
Ten Thousand Skies Above You by Claudia Gray
This is the second book in the Firebird series, which I believe will be a trilogy. I'm reading the first book, A Thousand Pieces of You, right now and I just know I will want the next book sooner than it's release -- which isn't until November!
The Raven King by Maggie Stiefvater
I'm only on the first book of this series, and I'm reading it very slowly as I'm participating in a book club on Goodreads for it. Although we won't finish the entire book until the month is over, I know afterwords I will be reading the next books immediately. It would be nice if the last book was out so that I could finish the entire series without waiting, but it looks like I'll be waiting awhile. This one is released towards the end of September.
The Boy Most Likely To by Huntley Fitzpatrick
This isn't technically a sequel, since it's only a companion novel, but I've wanted this book since I read The Boy Next Door. I'm so happy that it finally has a cover, but the release date still feels so far away. It won't be out until June!