It can be the Baltic States. Estonia for the city, Latvia for the coast (Highway 17 etc. chapters) and Lithunia for the forest maybe? Estonia can be the forest too, but i think Lithunia is a good candidate.
Borealis was supposed to contain portal technology.
Maybe Gordon can go to the future, maybe he can go back 20 years and stop the Resinance Cascade from happening? Possibilities are ENDLESS
Want:
Kraken Base, Air Exchange
Cut HL2 beta weapons.
More info on Gman
Basically more cut beta stuff. Make the story interesting like it was with the beta.
Multiplayer, which HL2 was supposed to get.
Possible visit to Xen or Combine Overworld.
Tau cannon from HL1
DO NOT WANT:
Alyx to die...