Well with most of the FUN under their control, I do expect some of the changes that could happen is that under the fortune of wheel we may soon have Fun tokens to be up for winning. Also, in wining lottery we might have the fun tokens to be won rather than btc which is now. Though this change depends upon admin if they want to introduce something like this.
The wheel of fortune is a new thing so may be yeah, the FUN tokens can be used as the rewards in the WOF.
For the lottery, I don't think freebitco.in would be using FUN tokens since it is one of their major thing that contributes towards their site.
Using bitcoin for the free spin and lottery is the essence of freebitco.in and I personally don't feel they will be changing that any time soon.