Halo will be an entirely new game engine from Firestorm Armada, and unfortunately won’t be compatible (but you could use covenant models as a stand in for another FSA race lol).
The battle box is said to be about 80 pounds, which I think is a good deal considering the sheer amount of models you get.
Here is a product description for their 2-Player battle box from their newsletter yesterday:
The Halo: Fleet Battles, The Fall of Reach two player battle box is the ultimate way for fans of the Halo Universe to recreate pivotal space battles between the stalwart forces of the United Nations Space Command (UNSC) and the relentless Covenant armada. Developed in close cooperation with 343 Industries, The Fall of Reach puts you at the centre of the most pivotal naval conflict of the long Human-Covenant War, commanding massive fleets of deadly warships as they clash above the fortified human colony of Reach. Take humanity’s last stand to the gaming table!
The Fall of Reach box contents include:
A full colour 100-page rulebook packed full of images and examples
Fall of Reach campaign guide
49 highly-detailed plastic ship models
25 custom Halo Dice
Fleet Commander Data Sheets
Flight Stands and Overlay Cards
Punch-out Scenery and Token sheets
Quick Guide reference sheets
Halo: Fleet Battles delivers an easy to learn, lore-infused, tactically-rich gaming experience that appeals both to experienced wargamers and fans of the Halo Universe.
The Fall of Reach box will be available to pre-order from the Spartan Games Online Store later this week.
Also they are developing a Halo ground combat game that should be at salute this year to!