Most of the updates so far have not corrupted any previously saved games (at least in my experience).

The big issue with updates is when new biomes (or new twists to existing biomes like mountain caves) are added as they will only appear in the appropriate, but still unexplored areas of existing games.

So there is really no reason to not play now if you have the itch as you can leave some areas unexplored waiting for the update or just play now and start a new world with the new biomes when they drop.