Well, when all they have worked on is the presentation and graphics, all they want to show are those. Don't worry, there should be a new arena and player face any day now.
Look at how quickly they tried to pull the stuff from E3. Also look at how tight lipped the NDA has been this year. Remember the days when we had game news and videos in May with the community days, all the developer diaries and game play videos.
You can bet that nothing has changed gameplay wise from last year, with only the puck physics now added (good or bad).