During my hassle with getting an unlock code (see Rage Golf discussion), I emailed just about everyone on the planet. One of those was to Rage.
Rage was very sympathetic to my issue, and, while unable to help me, they seemed willing to answer any questions I had.
My ONLY question to them is exactly that...any future courses? (Gotta wait for the time delay for an answer)
I personally believe that they are in a wait and see mode...how many games do they sell...does it cover the cost of the original development? Did they sell sufficient quantities to cover the cost of added courses? (Given that if 100 people buy the original, 60 buy add-ons)
One thing became very obvious in my emailing... everybody is holding their breath to see what the US market will do. Will the US embrace Club Nokia, the 9290, PDA games on phones in general, etc.?