Going to a separate scheme between terminals and gate numbers is a good thing. It was already confusing with T2E-KLM, was not helped at all with combining T2B and T2D, least to say the check-in switcheroo between T2F and T2E.
I can forgive going 3,5 on south, 4,6 on north of former T2, as it brings former T2F and T2G together in numbering, T6 and T7. Although in the same breath I must say, it doesn't matter anymore, the Terminal numbers are landside concept. They don't need to be next to each other.
The letters, however, are all over the place. Why throw them out so randomly, can't there be some sort of a system??