I just seen this TF2 video where the development team talk about the art direction, visual queues, lighting technology they have been working on for the game and I was very surprised about the lack of promotional BS in their words.
Usually in videos where developers talk about their game things like 'innovative' and 'never done before' are said a lot and when everybody actually plays the game it is painfully obvious that it is nothing like how the team described (a certain Peter M certainly isn't the only one in the industry that is guilty of over promoted what they are selling). For example there is an interview about Bioshock out there where it is said that the Telekinesis power in the game hasn't been done before in an FPS, but most gamers will instantly recognise a similarity between the game's Telekinesis power and HL2's Gravity Gun. So anyway I don't like the general level of BS that comes from most people in the industry, but I found this video to be a nice refreshing change.
The team clearly knows their stuff and by demonstrating that I am more confident that TF2 is going to be a good game.
P.S. While on the subject of art-direction and Bioshock there is a free Bioshock Artbook that is up for download as of today on the official website.
The artbook is in PDF format so I would highly recommend installing Foxit as an alternative PDF reader to Adobe's bloatware reader.