Version 1.4.0 of Cosmos adds pretty permalink support.
What this means is that instead of relying on ugly URL parameters, such as:
http://yoursite.com/landing-page/?clothing=t-shirts
You will be able to use a standard URL! The above becomes:
http://yoursite.com/landing-page/clothing/t-shirts/
Don’t worry, if you still want to use standard url parameters, you can!
UTM codes will still be able to be used for both tracking and generating dynamic content on your landing pages.