To be fair the last time he did have a point!
I suspect that as long as the DfT haven't dropped any clangers (and I would imagine if there is even a single brain cell in the DfT this will be watertight) he will express disappointment and leave it at that.
I think he'll actually say nothing at all, although the media may well seek a comment just because it will make for good copy.
While common sense that Virgin's stake (however small) would have meant Virgin branding on the route, Virgin wasn't already operating it so it hasn't 'lost' in the same way.