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The way I see it, there are only four possibilities this trailer snippet suggests.
1. Game Freak somehow managed to get the high poly models to run well in the overworld, and they will simply use those. (If this is the case, it makes you question why low poly models were ever used in the first place).
2. Game Freak has created a whole set of low poly Pokemon models that have the same rig as the high poly, and will transfer over the datamined walking animations we have seen to the low poly (This is a large amount of work by Game Freak standards).
3. The number of following Pokemon will be limited to ones that already have low poly models that you see in the overworld in SM (such as the starters, Miltank, Pyukumuku, Pikachu, Tauros etc.) because they have already done that work.
4. Rockruff will be a unique case and be the only following Pokemon (or overworld following NPC).
