Reports are that as of Oct. 1, there is a significant price increase. I have heard anywhere from $187 - $234. No more "driver only" cruises, now snacks will be provided for the base price and if you want decorations or a cake, it's more. I have also heard they have decreased the number of boats for Illuminations to 2 plus the Breathless and 5 for Wishes, but I have also heard the maximum is 8 people.
So, taking all that into consideration, I'd definately ask a lot of questions if you are lucky enough to reserve one.
Good luck!