Although I received a letter with my Mickey Mail three weeks ago saying Preferred Viewing at MK had been removed, I've just received another letter with two vouchers in one for Wishes and one for Illuminations So I presume if you booked the package back when it was still included they're honouring it ))
I think they are honouring Epcot although we didn't use it as it looked full when we got there and to be honest we didn't need to. As for Wishes the area that used to be preferred viewing is surrounded by boards and is being dug up, we were told it was unavailable.
Hope that helps.