As seen in post #1 there's extra road data provided by Tracks4Africa in this release. Adding to that the fact that Garmin has acquired GARMAP gives some indication of how this map will evolve.

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Garmap E Africa Streetmaps V1.3 ˜37 MB (NON-NT variant only).

NT maps are only used if there is routing data. NT maps doesn't allow you to untick/deselect routing data in MapSource. If one compiles a map that doesn't have routing and enables NT compression, you will get a larger size than a NON-NT map.
Garmin East Africa NT 2012.30 is 390 MiB with NT compression and GARMAP East Africa Streetmaps v1.3 is 39 MiB NON-NT.

Let's see the outcome when Garmin and GARMAP merges their map products.