This is helpful for me. I am in the same situation as you, I took delivery in July, and was on .104. I kept not getting a software update and complained and asked why. I had friends getting 3 updates in the time it took me to get one. I finally emailed them then they accidentally copied me on a message saying this is the guy who was 'bugging' drew about updates, which pissed me off.
But having you post this makes me think that there are minor and major releases, and you may only be eligible for a major release every so often. The thing that is weird to me is that the past 2 updates I have gotten .104 and .105 today, all have the exact same release notes as my factory firmware had, and the 2 updates, word for word. That seemed weird, I would think it would say something like bug fixes or something but not copy the same release notes.