I already have my lambda / roles defined in cloudformation and would love to also use it to add a scheduled eventsources ... are there any docs or examples around ?
As of this week (18 April 2016) it is now possible to add a scheduled CloudWatch event rule that will trigger your Lambda function.
The AWS::Event::Rule has a ScheduleExpression field for the cron-style schedule and a Targets array which can accept a Lambda function ARN.
ScheduleExpression
Targets