Earlier this week, the Internet Archive uploaded a few hundred CD-ROMs with press kits for computer games.
I skimmed over it and found an interesting item in a related collection: A press kit that was produced by Infogrames in 1998 for the E3.
It does, in fact, contain artwork for F-22 ADF, Red Sea Operations, and Total Air War Moreover, since it was released months before TAW hit the stores, all TAW content is automatically beta content.
The files were in obscure Mac formats (ever heard of .RTF?! *cough*), so I converted everything to PNG/HTML and uploaded it here:
http://krishty.com/taw/infogrames-e3-1998-press-kit/
Have fun!