I believe they mean #1. Specifically packages that are intended to be deployed on AmazonLinux.
you could use base package distros
AmazonLinux's similarity to RHEL 5 and 6 means they will need few, if any, code changes. I wouldn't consider it entirely correct to use the currently-supported RHEL 5 and RHEL 6 packages that Bigtop distributes on AmazonLinux, even though they might work. I suspect this JIRA is to get Bigtop to a state where AmazonLinux can be supported in the same sense as RHEL 6 - where a release is actually accompanied by packages targeted for that system.
As I type this I'm actually watching Rob setup Jenkins slaves for AmazonLinux