I have just done this tour last month and got back last Thursday. It was a pretty amazing tour!
As for wifi, sadly no wifi. Someone on my tour did find a hotspot on the off occassion and they think you would have to pay for a set time limit on the bus but our tour guide didn't know anything about it. All the hotels we stayed at heaps of free wifi! I bought a sim card which I was very grateful for but I used wifi heaps whenever I could!
If you have any more questions about the tour just message me