Why are most of your predictions, for next expansion, always based around Holidays?
MoP clearly showed its release wasnt a Holiday(like Xmas).
Blizzard is sticking to their guns with faster patches, whether its content or non, its still a patch regardless.
If you look at your Wrathion questline, its goes to Chapter 4, which common sense says 5.4(if you know how to count).
Chptr 1 - 5.0
Chptr 2 - 5.1
Chptr 3 - 5.2
Chptr 4 - 5.3
Final Quest - Kill Garrosh 5.4
Follow the storyline and use common sense. I dont how people are coming up with 5.5, 5.6, 5.7. Try trusting Blizzard when they say theyre not happy with long content patches and WILL BE releasing them out faster.