I took a look at the key dates for GenCon 2017, and I saw something interesting.
According to them, the badge pre-registration begins on January 29th. That's a Sunday.
In the past two years (the ones with the housing lottery), the pre-reg has been on a Friday, with hotel registration beginning on Sunday.
In the years before that (at least since 2011, when I started attending), badge pre-reg was also on Sunday. Meaning presumably the hotel registration will be on Tuesday again.
Makes me wonder if the pattern will continue and they might be getting rid of the housing lottery. Wishful thinking, maybe - but who knows?