I bought the game separate from AA for $20. The game is short, but the multi-player makes up for that. The game includes things like:
*Heavy artillery use
*Gun whipping for all weapons
*Smoke grenades
*Portable MG42
*12 new MP maps
*9 new SP maps
*New MP mode, "Tug of War"
All in all it's a good game, but not to be compared with AA in my opinion.
I have the 2.15 patch for Spearhead, also. My game came with 2.00, so I had to download 2 patches, the 2.11 being 54MB!