I would like all subclasses to start at 3rd level for a variety of reasons. Besides this, point (1) suggests me that they should give more room to subclasses features, e.g. have at least 6 features (currently the Monk has 4 and a couple more classes have 5, the rest have 6+). Not so much because the current subclasses necessarily need that many, but having only 4-5 eventually might be restrictive for future subclasses concepts. They could consider taking some of the less iconic class features for some classes and turn them into subclass features.
I strongly dislike retraining rules, thus I very much hope that what they say in (2) is going to become true... Guidelines in the DMG are fine, even a default rule in the DMG is acceptable, but please no rule in the PHB. It's too much player's entitlement to have retraining rules available by default, which means they end up making the default very rigid/limited, and then it always screw up that only player that would need help because he made an honest mistake.
Point (3) sound totally fine, it's what they've been talking for a long time. I could see Berserker, War Domain, Circle of the Land (Forest), Path of the Warrior, Way of the Open Hand, Oath of Devotion, Path of the Horde Breaker and Thievery Style already being the possible choices. We may not have a Wizard Tradition yet for this, perhaps some Academic/Generalist School is needed.