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Please don't be disappointed if your structures don't get their deserved attention right now. You're just a bit early.
Updates will come out when they're done. There's not much more we can say about that. Unexpected bugs, spontaneous additional features, last-moment changes and especially everything RL related are all factors that play into that, so we can't offer a set update schedule.
And regarding Gen 4: I'm pretty sure you can expect the next stable update to have them all. However as stated above, we can't say when that will be.
The twitter pictures do confirm that those Pokémon are fully modeled and animated and ready to be implemented - implementing them (and their gameplay features) takes some time too though. At the moment that time is better spent fixing bugs and finalizing other content to get it into testing.