yeah, those are the only benefits. it's not a more powerful processor... it's just a more efficient/smaller version of the same processor. an upgrade like this wiill only change heat (important b/c this is tied to most failures), cost (ver important), and via this, noise.
the benq new dvd will not load faster. it's the same speed. the 65nm/new dvd isn't about making the console more powerful, it's about making it cheaper to make, and less likely to break.