A couple of screenshots of the upcoming OmniFocus 2 has been released, and it has been heavily inspired by the iPad app. It looks great, but I really hope that it will be easier to navigate than the iPad version, which can be a bit tedious if you have many projects and folder levels.
The new Forecast moded shows you a summary of your upcoming time-based commitments at a glance in the sidebar. You can leave the forecast collapsed to see the next several days (as in the screenshot), or expand the forecast to see an entire month in your sidebar. From the forecast, you can select any combination of days to see a detailed schedule includes scheduled tasks from OmniFocus integrated with events from your calendar.
I hope that the Forecast view will support adding calendar events in addition to viewing them. That would mean it can be a full replacement for iCal.