I think one reson with the delay is that you need to have an appropriate "vehicle" a core revision that makes enough / big enough changes in the same area as the new feature, so that you can add the feature. In this particular case, AMD has not done any (or enough) changes in area where micro-op fusion would go to, so it didn't get implemented.
If K8L only touches FP / SSE, it may not be implemented again.
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