ChrisN Galileo will not be compatible with existing GPS receivers, but will not interfere with them either.
I suspect that we will see dual mode receivers appearing at some point in a year or so.
As PhilD points out, Galileo is supposed to pay for itself (atleast partly) but the pricing model has not been worked out yet. Possibilities are: (1) upfront license, (2) pay per use, (3) monthly charge, (4) some other devious method and (5) a combination of the above.
My opinion (and that is all it is) is that Galileo services will start out quite cheap so that we get hooked and then the price will go up (i.e the cable TV pricing model
).
Who knows, it may even be free for non-commercial use. For most of us who are still impressed that GPS works as well as it does, Galileo will have to offer something pretty special before parting with any money.
TallGuy.