I think what most of us are expecting from 5.4 is the rewards to be able to rank up 1 or 2 champions to rank 5 as a 5 star.
They might give out:
4 t5b
12 t2 alphas etc.
But here is an even better idea. We have seen the introduction to rank up gems. 4* rank 4-5, and 5* from rank 2-3. How cool would it be to see you got a crystal which gave you a random class of which could go from rank 4-5. Cant wait to pull another science

Let me know your thoughts.