At this point, I would prefer a subclass scheme that goes 1st level, 2nd level, 6th level, 10th level, 14th level. 1st level would offer more basic benefits that you would expect the subclass to have such as additional relevant skills, bonus spells, weapon proficiencies, armor training and possibly a ribbon feature, while 2nd level would get the real crunchy unique feature that the rest of the subclass will build on.
I imagine if they keep the 3rd, 6th, 10th and 14th level subclass scheme we are going to see some pretty big changes to some of the priest and mage subclasses. I imagine that Cleric might get a domain choice at 2nd level. Domains would no longer be subclasses but instead might just be a list of bonus spells at 2nd, 4th, 6th, 8th and 10th level like the Song of Restoration on the Bard as well as an alternative use of Channel Divinitiy. Subclasses would be a lot broader with an option for a Warpriest, a Cloistered Cleric and an Evangelist to cover some of the basic archetypes and possibly something one oddball subclass for flavor.
I could probably live with either. If they start cramming a bunch of bonus spells and expected proficiencies and training at 3rd level, I would prefer they go to a 1st level/2nd level type plan instead. I will definitely wait to see what they do before I judge though.