No, no schemes at all actually, that's the ironic part. As Indirik noted elsewhere, after all the things SA actually did, it's kind of funny that they had to fabricate a reason for war. Caerwyn's behavior the last couple months has certainly put Astrum in warier frame of mind as regards them, but no one that I know about in either Astrum or the Church actually had any plans for Caerwyn at all, and considering the fact that I rule Astrum I would hope that I would know if someone was planning something unpleasant, seeing as how Astrum would probably be a key piece of any such plan.
In any case, I do believe the war will be very entertaining for everyone involved, win or lose. Definitely the largest conflict Dwilight has ever seen, or is likely to see.