After tearing off the roofing material (which was planned), he noticed that a lot of the roof decking was rotted (also expected), and the joists for the porch ceiling were also rotted and the whole ceiling will have to come down (again, expected).
Unfortunately, it looks like the wall studs may be rotten. This was not unexpected completely, but was more one of those hopefully-not things.
The bad part is that it looks like some of the wall studs on the house side of the porch are rotted as well. And that is an unexpected and HUGELY sucky thing.
Because that is a load-bearing wall, it means that the inside porch wall will have to come off (which is basically concrete), which means that temporary braces will have to be put up on the inside of the living room to handle the load before the porch comes down and that wall repaired.
That's a metric buttload of work more than what was planned. A sucking metric buttload. And it's going to be an expensive fix. Sucking expensive.
Of course, it's better to discover this now than when the house collapsed.
On a good note, at least the floor looks undamaged.