We have received more information about the releases of Steins;Gate and Steins;Gate 0 on Steam:

Steins;Gate’s price will be reduced from $35/32€ to $30/27€ on May 1st.

Steins;Gate 0 will cost $35/30€.

There will be a Steins;Gate + Steins;Gate 0 bundle for $58.48/51.28€.

Steins;Gate Elite’s price has yet to be determined.

Users who purchase the bundle will save 10% on both games, while users who have already purchased Steins;Gate can save 10% on Steins;Gate 0.

UPDATE: Added the price in euros and dollars.