It's been a while.. either way, it's fairly small as there aren't that many new graphical assets and so far in the beta the new ships' voices are placeholders using the current ones.

Edit: Beaten

Entrenchment won't be boxed, unfortunately. It's too cheap to make boxing and finding retail space any sort of profitable Once all the mini expansions are squeezed out they've tossed around the idea of boxing them all, but they haven't committed to anything.

Edit: Do note that the current beta release of Entrenchment will completely overwrite your Sins 1.12 install. If you want to be able to play Sins 1.12, you should make a copy of the installation folder first, then update to Entrenchment. Then you can run Sins 1.12 off the copied folder, and Entrenchment out of the original. The final release won't need to have you do this, but I figured I should give you a heads up so you won't be stuck having to re-download all of Sins