First of all, GamerTag Radio has posted a YouTube video of the Street Trace: NYC preview event. It includes a few seconds of the 'Arena board', which we've cut out and put online here (584k, AVI). It's blurry, but you get an impression of how the artwork is layed out.
Next, we've put together a speculative list of everything on the board - you can identify individual pieces using the numbers attached to the first image.
1. Arrow upgrades concept art.
2. Confederation pilot concept art.
3. Kilrathi pilot concept art.
4. Rapier blueprint rendering.
5. Sketches: Paktahn, Gothri, Darket, Centurion, Dralthi, Rapier, Broadsword.
6. Firekkan pilot concept art.
7. Mercenary pilot concept art.
8. Award icons concept.
9. Paktahn early rendering.
10. Rapier early rendering.
11. 3D head test renderings.
12. Gun blast artwork.
13. Gaia website printout.
14. In-game screenshot.
15. Pre-Renderd Artwork.
16. In-game screenshot.
17. In-game screenshot.
18. Award icons concept.
19. WC2-style cockpit cutscene test rendering.
20. F-27 Arrow final rendering.
21. F-44 Rapier II final rendering.
22. A-17 Broadsword final rendering.
23. Darket final rendering.
24. Dralthi IX final rendering.
25. Paktahn final rendering.
26. Terran Battlecruiser final rendering.
Unnumbered: Electronic Arts logo.
Unnumbered: Wing Commander Arena logo.
Unnumbered: Gaia Industries logo.