I can't remember any android devices that have got two full point updates, even the nexus devices only get one update. (phonearena.com)
Each of the bullet point updates is fairly vague, as words like «improved» are tough to gauge until actually seeing them implemented. (gizmodo.com)
They have also shown that constant and major point updates are possible without disrupting the user experience and breaking compatibility every single time. (techspot.com)