I have no idea what company the Celebration Hotel belongs to but I can confirm that on one side of the sign it now says "Bohemian". I don't know when this changed. It was not like that when I was here the beginning of April, but we noticed it last week when we arrived.
It does look like it's what used to be The Celebration Hotel, I also pulled it up on the Marriot website, so it does appear to have been taken over by Marriot.
Hopefully the kept the chef for the restaurant as the food there was excellent.
I don't believe the hotel has become a Marriott property. Its really just a marketing relationship whereby you can book it on the Marriott site. Don't know if you can get any Marriott points or elite perks though.
It Is now a Mariott they bought a hand full of smaller hotels. My father travel a lot he has spent 80 nights so far in a mariott this year already!! We have booked a stay in the last week in sep. We can use Mariott points and not waste our dvc points on the weekend!!!! I am so happy that we can be soo close to disney and not feel too off from disney!