Chiyomaru Shikura has announced that there will be another entry in the Steins;Gate franchise, which will be called Steins;Gate 0, and will include both a visual novel and an anime. You can see the trailer below:
Zero will be taking place in the beta timeline, and will feature a new character. Other than that not much information is known.
The original Steins;Gate VN was released in English last year for PC.
The anime adaption of Steins;Gate aired in 2012 and is licensed by Funimation.