Can anyone help with the location of the Total War campaign? Page 35 of the Beta Rules describes the Spinward Front being near the Calixis Sector.

If anyone can direct me to a map, I'd appreciate it.

The fluff for the Spinward Front (including the map) are not yet released for player viewing as far as I know. The beta lacks particular large amounts of fluff and art, which is part of the point of this as the beta was only meant to include mostly the mechanics of the game so people could play it and test it out.

What Sworn said - if I run the game outside of my playtest group, I'm planning on using the Jericho Reach from Deathwatch as a setting - there are plenty of Imperial Guard there to fight as!