The Tropico 3 interview on gry.o2.pl talks with Boian Spasov of Haemimont Games about the next installment in the strategy management series. The main body of the conversation is Polish, but the right hand column also offers the entire conversation in English. They discuss game mechanics, how the sequel is similar and dissimilar to its predecessors. One of the answers says their preliminary system specifications should be close to those of Grand Ages: Rome:

At this stage of the development of the game nothing is yet set in stone, but we aim for minimal system requirements close to those of our previous title - Grand Ages: Rome. Those were:
Windows XP or Vista;
2.0 GHz Pentium 4/Athlon processor or better;
DirectX 9 compatible 3D graphics card with 128MB Ram - GeForce 6600 (ATI 9600) or better;
1 Gb RAM;
8 x DVD-ROM Drive;
1.5 Gb free hard disk space.