Well, new weapon systems (no more Terran Turrets), Frigates (using the Iceni as a starting point), new Cruisers (either Anti-Fighter or Anti-Cap, like a new Aeolus or a Lilith-style GTVA-Cruiser), maybe even Corvettes with fighterbays like the Moloch had. In general I'd think, that some of the older ship types are scrapped for newer versions, while the newer ones just get upgrades. Of course GTVA would probably invest quite some time in investigations of shivan tech and some of the more modern technologys, like stealth-fighters, meson-bombs, AWACS oder TAG.
Thinking about it a second time, I guess GTVA might even start to explore some of the yet unknown systems. Loosing Capella means that they need new space for the refugees and new ressource-sources.
But of course, that's just my guess.