We know there's still a lot to do and improve in yCal. We continuously add things to our internal to-do list as we're using yCal ourselves on a daily basis. The lists of bullets below are not exhaustive and don't come with a guarantee that we'll complete these items in a specific time-frame... but they may give you an idea of a few things we're currently thinking about.
Update mid 2016: I have to admit that our update rate for yCal has been lower over the past months, and, most likely, will remain low for the coming months. The reason simply is that I've now two little kids, a 3 year old girl, and a newly born little boy, and family business is just eating up all my time like chocolate. I still remain deeply committed to updating and advancing yCal, and you'll continue to see bug fixes, adaptations to new MacOS versions, and new features. But please bear with me if things move a little slower than usual!
Of course I'm also eager to receive your feedback and hear about your suggestions! So if you have questions, feature requests, or suggestions, please let us know!
Updated: April 2017