If there's a 4.4 update coming soon, definitely wait for that! Firmware needs to be designed with specific hardware in mind. I suspect that none of the ones in that download link will work on the C67ML Carta 2. Different screen resolutions, different hardware. You'd probably end up with a bootloop if you tried one.
No one, as far as I know, has ever developed a custom ROM for this device based on 4.4. Nothing out there is newer than 4.2.2, as far s I can see. Unless there is one lurking out there somewhere, wait for the Onyx upgrade.
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