Despite Casio hasn’t unveiled the details yet, nor the manual, it seems that the new Casiotone series is based on the AHL chip. And taking into account the info and specs that Casio has offered, the CT-S300 seems to me suspiciously similar to the CTK 3500 model: both have 400 tones...
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With the velocity sensitive keys and pitch bend wheel, I agree with Shad0wfax that there's a good chance the CT-S300 will have similar functionality to the CTK-3500. As soon as the manual gets released and we can see the MIDI implementation, we'll know for sure, but the main thing...