I was really hoping for some kind of replacement for the god-awful Cloudwatch dashboards, which AWS doesn't even use internally because they are borderline useless (source, worked in AWS and built many dashboards)
I was really hoping it would be 7 new SDKs and 65 new billing metrics.
I got super excited they would have better charting for Cloudwatch. I used Datadog for awhile and the charting system was amazing there. Hopefully, one day they'll improve Cloudwatch.