I wouldnt have though the publisher would be too worried about what its written in, as long as it is fun & is of a high standard.
Although saying that, I suspect most AAA publishers would be keen to know weather there would be a future market on other platforms for your game too. C++ would certainly make the actual game code more portable than blitz as its not relying on a unique language with a built in engine relying on windows & DX.
Although saying that, I suspect most AAA publishers would be keen to know weather there would be a future market on other platforms for your game too. C++ would certainly make the actual game code more portable than blitz as its not relying on a unique language with a built in engine relying on windows & DX.