And heck, I don't even think they are going to end up doing that and reverting everyone back to the 5E14 version.  Paladin subclass features come in at 3, 7, 15 , & 20-- and with the advent of epic boons at 20th level I don't think there's any way they're going overlap that with the final paladin subclass feature.  That feature will probably get bumped up to like 18th or 19th most likely.
To be honest... once you move all the initial subclasses features to 3rd level I really don't see the ones behind them mattering that much whether they are on a matching schedule or not.  Here's what they will look like with a 5E14 format but everyone starting at 3rd level:
Barbarian / Druid / Warlock / Wizard:  3, 6, 10, 14
Cleric: 3, 6, 8, 17
Fighter: 3, 7, 10, 15, 18
Monk: 3, 6, 11, 17
Paladin: 3, 7, 15, 20
Ranger: 3, 7, 11, 15
Rogue: 3, 9, 13, 17
Sorcerer: 3, 6, 14, 18
Bard: 3, 6, 14
So four of the subclasses are already at the standardized placement, Ranger is just one level later for every feature past 3rd (so they might as well be on the standardized path), the Fighter has an extra feature and the Bard is a feature down, and the rest all have their final feature in Tier 4 at 17th+ level, so those features might as well not even exist for 95% of the tables out there.
So personally I don't see anything worthwhile in maintaining the 5E14 format either.  I think most players would actually like their fourth subclass feature to arrive prior to 15th level in Tier 3 so that they might get more use.  Whether or not they are on a 3, 6, 10, 14 schedule or move a level up or down for some classes here or there is fine... but if they officially establish all classes get 4 features and the first one arrives at 3rd level... the placements of the rest won't actually matter to players all that much.