I haven't heard. But if they're just software bugs I wouldn't worry since the unit can be easily upgraded over the internet (Sony has released numerous firmware upgrades for the PSP which fixed problems and even added major new features).

In fact, this is one reason I think the PS3 will be one of the better Blu-Ray players on the market, especially for bleeding edge adopters: the PS3's product lifespan will be MUCH longer than any standalone Blu-Ray player, and the sales numbers will be much higher - so any issues will be fixed. And when new features become in demand (such as new audio formats) it can be upgraded...