The pessimist in me keeps thinking there might not be a fourth OST. I only bought the first OST after it came out, but both volumes 2 and 3 were scheduled for a release long before their respective arcs ended, and came out just as they did end. Yet still no sign of Volume 4 on CDJapan or the Japan Amazon.
That said looking up both SEED and Destiny there were fairly hefty waits for the last soundtracks for both series going by their release dates, so it could be one of those waits again.
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