After several years in development, GSC Game World's S.T.A.L.K.E.R.: Shadow of Chernobyl arrived in March to mostly positive reviews—at least, positive enough to get GSC to start work on a prequel, S.T.A.L.K.E.R.: Clear Sky, which is scheduled for the first quarter of next year.
With nearly two S.T.A.L.K.E.R. games under their belt, the people at GSC are now contemplating more ambitious ventures. As Shacknews reports, the Ukrainian software firm has publicly revealed in a community Q&A that it is "seriously considering" a massively multiplayer online S.T.A.L.K.E.R. title. That said, GSC added it has no plans to add a cooperative multiplayer mode to either Shadow of Chernobyl or Clear Sky.
In the same Q&A, GSC also discusses the updated graphics engine for Clear Sky. The company says its X-Ray engine "underwent fairly serious changes," such as performance optimizations, the addition of DirectX 10 support and volumetric lighting, and a higher level of overall graphical detail. Shacknews has some screenshots of the game here.