I haven't seen anything about that. In any case, I've had a rethink about letting you swap with Pompeii Ruler.

If Mearas IS going out for a spell, then it wouldn't be fair on the others in the comp who've just picked him, if I let you put Pompeii Ruler in instead.

So, for the moment, you still have Mearas in your stable. If you want to put Pompeii Ruler in instead of him, then I'm afraid you'll have to delete another horse as well. Sorry about that.