There is no guarantee than the One S will be launched at a price point below 30k. It has been launched at 34k (after conversion) in Europe, just 1-2k below the One X. It has a Super AMOLED (though not HD) screen, Qc Krait (claimed to be faster than the quad core Tegra 3), so a ~30k price is really unlikely. Expect it to launch at ~33-34k
I doubt it mate. One X is clearly the HTC flagship. One S is inferior in screen resolution, screen size, screen technology (huge different between pentile amoled and slcd2), storage and even though Krait is efficient and faster clock to clock, Tegra3 might get better as apps start to utilize multiple cores, so One X is also kinda future proof for a long time to come.
I think there's a difference of 100 euros between the two. Also in India, few people have already got One X for a great deal at 34.2k. Considering this, One S should come in under 30k is what I feel. That would be in direct competition to Xperia S. If any higher than 30k, One X is clearly the better option then. Read somewhere that HTC is waiting for Sensation stocks to clear out before they bring in One S here.