When the ota ics update drops, it will look like stock tw. This is why ss and overstew are already starting the process of making ics4ics.
Honestly, you will not revert much if you use ics2.4.1 on calk2.9.x. The update from 2.8.1 to 2.9.x was not drastic and mostly cosmetic vs performance based. If you value having this great ics theme on calk, you might as well flash it now. If you value having every apk on the latest release, then wait. But you may turn blue, as others mentioned, they have other priorities than updating for every incremental gb release.
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