It needs (better) Google Calendar support. I know it supports synced calendars in a round about way through the builtin calendar app, but it isn't ideal and it merges all synced calendars into 1.
What calendars are you using? I went ahead and got this, and the default calendar app has gone into the I don't use folder already..
I've just created a test appointment in my default google calendar and it's showing up differently from the family one that's shared with the husband, and then different to the UK holidays one I'm subscribed to.