personally, i am of the belief that there are going to be 20 episodes in fourth stage. i have no proof of this, i'm just going by knowing what hapens in the manga and the games as well as the fact that we got a new op at episode 11. that would be ten episodes per op, and with initial d thay have usually changed op's at the halfway point of the series. (if memory serves.)
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shen
In First Stage, they used Around the World for the first 19 episodes, then used Break In2 the Night for only the last 7. Second Stage only had one OP, Blazin' Beat.
I haven't read the manga, but just based on what everyone's saying around here, I'd guess that Fourth Stage will wrap up with the s2000/Skyline battles somewhere around ep 22 (maybe 24). Takumi's battle against his dad seems big enough that I think they'll make it into "Fifth Stage: The Movie".
Really? Does the first ID4S D Selection 1, include the sound files as part of the set or not?
No, the Sound Files (BGM) and the D Selections (Eurobeat) are separate albums.