Edit: I've updated the thread title so I can include current status of non-museum sights.
At least some of this is not new info, but I thought it might be helpful to have this information in a single post. I have reported the current status using the guidebook-updates link.
The Museum of Fine Arts is closed but will re-open on October 31 of this year. Some highlights are suposedly at the Hungarian National Gallery (haven't been there yet), but logic suggests that there may be a period later in the year when those items are on their way back to the MFA and not on view anywhere.
The Museum of Applied Arts is closed for an extended period for refurbishment.
The Museum of Ethnography is closed until 2020 for relocation.
In possibly-related news (given that the three closed museums were major participants in the past), there are some adjustments to the Budapest Card's coverage this year. A couple of smaller places that used to be discounted 50% are now fully covered. Unfortunately, the very expensive tour of the Liszt Ferenc Academy is now half-price rather than free. Win some, lose some.
In other news, I found no ATM option at the airport other than the maligned Euronet. I took a deep breath and gave it a try. It pushed DCC very hard but did allow me to complete the transaction in forints after threatening me with an unknown exchange rate. There was no sign of a fee being charged by the ATM itself. I won't be sure until after I return home, but I'm assuming the exchange rate for that withdrawal will be essentially the same as for the bank-ATM withdrawal I made later.
I'm a bit puzzled about the number of people I've seen clustered around exchange booths here. I don't usually notice anyone using them.