Just an idea...
In the interest of showing people that AAAGames is indeed serious about this project, I thought it might be worthwhile to consider starting a weekly dev blog to summarize the previous week's accomplishments, next week's goals, and upcoming plans in regards to the development of the game.
Making this blog visible on Steam could go a long way towards attracting hesitant or skeptical buyers. People can relate to developers' struggles better when they can see exactly what is going on behind the scenes on a day-to-day basis.
This wouldn't have to be anything terribly time consuming or involved, either... 1-2 pages including a picture or two on a Friday, weekend, or Monday would allow people to see into your world and get excited about upcoming changes.
Creating and linking to a matching reply thread here on these forums with every blog post would also allow people to give you feedback in regards to what is good, what is not so good, and what needs to be re-thought when it comes to changes and improvements.
For example:
Week 47:
We have finally implemented 'x' series of updates that we have been working on for the last two months, we think they should add a lot of new possibilities to the game...
[...]
Tell us what you think.
[link to week 47 forum thread]
Something like this could also be done on a bi-weekly basis as well if weekly would be too stressful.