OK, just got Volume 8 today...here's a list of ships and MS that make appearances, divided by faction.
Asuna's mothership is the Irish-class battleship Zwickbau, and its captain is a fellow named Bernardo Ferre. She pilots a Rick Dias, along with Jack Bayard and a guy named Gorro...who also happens to be the guy who messed with her Nemo in the last volume. Her Le Cygne is delivered on a Columbus-class transport ship named the Naimiya. A new character, Hensel Hinockel, is introduced as the Le Cygne's test pilot, though he's never actually seen piloting it.
Yahagi, Forma, and Erisia all return after a long absence. Yahagi pilots a Marasai, Forma is the captain of the Alexandria-class Al Qasr, and Erisia pilots a Gaplant (just a normal one, not her custom version).
On another note, here's an amusing error I noticed...in the timeline in this volume, it says that Asuna was born in UC 0079. This volume takes place in UC 0087. Now, I know that the main characters in Gundam tend to be young, but I think it's a bit much to have a 7-year-old as a pilot.
Edit: Gorro pilots a Nemo, not a Rick Dias.