It was announced in this weeks issue of Weekly Famitsu that 5pb will be porting Steins;Gate: Linear Bounded Phenogram (Steins;Gate Senkei Kousoku no Phenogram / STEINS;GATE 線形拘束のフェノグラム) from the Playstation 3 and Xbox360 to the Playstation Vita. The port is set to be available this coming Winter in Japan.
While the original Steins;Gate followed through the eyes of Rintarou Okabe as he traversed through many world lines and attractor fields to ensure the safety of mankind in the future, Linear Bounded Phenogram focuses on the other members of the Future Gadget Laboratory and how they personally respond to the events that unfold.
Given there is no PC release, the chances of this seeing a release outside of Japan are slim. However JAST USA have since picked up the rights to the original Steins;Gate visual novel and have plans to release it in English sometime in the future.