In view of the large number of renders that the game has anyway, the few new special renders per update are hardly significant. It's always been the case that we have to wait about 8 months for each update. But we always got a full chapter for that. Nothing has changed about that.
Next nobody knows for sure how long the game will be at the end, except for the developer himself. Maybe we're at about 70% of the planned content, maybe only 50%, maybe more, maybe less. Either way, it will definitely be years before the full version is available. The special renders will not change that much either.