I don't think you asking the nice people at Sinergy for a patch will make then do one. If one is planned, they'll be one. Think about it, the first one adressed some issues, but by no means all. They had to release a patch quite quickly, or the game will be considered not worth buying by the cashual gamer. All the problems couldnt be sorted in one patch.
As for gp5, I think we'll all buy it. It'll be the final gp game, therefore the best. After messing up gp4 somewhat, gp5 will have to be good. Also we know they're capable of good games, gp2, gp3 and 2000.
GP32000 and GP4 I bought them the very day the were published here in Italy. I won't do the same with GP5: I'd buy it only if and when I'll be sure it works fine. I don't think is wise for us to say "well with GP4 went this way, shame but we can't help, we have to wait for GP5 to have a good software" I spent my 50 euro on GP4 and I'm still waiting to have what I was promised for them. That's it.
The point is: i spent 50 Euro (not 5 or 6 - FIFTY!!) for a game that not only is full of bugs but doesn't work on many systems that do not use strange or out-of-ordinary components or set-up.