I am writing this from a hilltop lodge in Nagarkot just outside Kathmandu, so consider this first hand, 100% up to date information.

Yes, there's a lot of damage from the earthquake. Lots of rubble, many destroyed buildings. Kathmandu is not too bad, maybe 5% of buildings destroyed, but other cities like Bhaktapur more like 20%. Some of the world heritage sites are quite damaged but still well worth seeing even in this state. The lowlands to the south are pretty much untouched. Up in the mountains to the north and the small villages there's much more damage.

Most of the hotels and tourist sites are open, and are quite frankly desperate for the tourists to come back - it's such a massive part of the economy, and the average person on the street doesn't see any of the aid coming through from the government.

There are still aftershocks, I felt a baby one (3.7) a few nights ago, but it's not much riskier now than at any other time in the last 10 years - the general feeling among locals is that the big ones have been and gone.

My advice: well worth coming now, as you'll have the place mostly to yourself. Kathmandu valley and the south, like Chitwan National Park, are OK. I would say that doing the treks up to Everest Base Camp or the Annapurna circuit are not advisable now, they need longer to recover. Pokhara I don't know about, we'll be there in a few days.