It seems a little strange to me that there's news of a potentially disabled contestant now, when the latest we heard about the new house was that the evicted housemates would be leaving by a staircase leading from the diary room.
In so far as the tasks are concerned - the fire task, learning 15 facts about each other, world records, and the 'getting to know you' tasks would have been perfectly suitable for a disabled contestant. The others - dance task, drum kit task and playground task definitely would not.
It would require a lot of though on Big Brother's part to come up with a complete range of tasks suitable for a disabled contestant, but which would also stretch the other contestants physically as well.
............... I guess time will tell!