It's coming. The 2015 NFL schedule will officially be released Tuesday, April 21 at 5pm Pacific time (8pm Eastern).
The event will be televised on NFL Network in a 3-hour milking session from 5pm-8pm Pacific time (8pm-11pm).
We already know the Raiders opponents for the season both home and away. They are as follows:
We also have a general idea of their preseason schedule, which you can see here.
You can also see the Raiders offseason schedule and events calendar here.