(excuse any bad english trad)
Personally I would like a sequel telling the attack on the republic of Gorasnaya (The most important country of the UIR) by General Karn, we could control a new squad of UIR characters including Paduk.
The environment would be forest and snow to contrast with base game
On the arsenal side, we would have new weapons as well as the Markza, the Booshka and my favorite the Breechshot. Tripwire crossbow would be cool to use in GT too
Bestiary, of course we would have the arrival of Ragers, which could be interesting to fight in Gears Tactics, a “semi sniper” unit which enters berserker mode like grenadiers, when injured but with a bigger life bonus
Other flagship locusts such as the flame thrower or Grinder, the Mauler and their shield that we would have to go around to kill
Cyclops that could come to cut us off and even have a lanzor duel with one of our characters
More in-depth management side where a URI fortress which resists locust attacks, we have to defend it
It would be nice is that we can also find bonus docs on the maps to enhance the lore of the saga and explain certain events
Any other ideas for a suite?
).