* Increased headshot multipliers for sniper rifles. Sniper rifles with suppressors equipped will now always be ensured one-shot kill headshots.
* Subtle increase in sniper rifle accuracy when scoping in.
As for the knife, Vahn had this to say.
“We’ve made some changes to the knife tunables that will be available in the next game update.
We are not currently planning to remove the lunge, make the knife a 2 hit kill in the front, or make you pull it out to use it. These are all good community suggestions that are appropriate for a future game that has a Barebones or Pure version.
That said, after thinking about a bit more, it seemed reasonable that we could do additional (and larger) experiments on the lunge and swipe ranges and see how they play out.”
The only thing that needs to be fixed with the knife is the auto-aim.
Snipers are pretty moot in Black Ops, compared to previous CoD games. The only map I've noticed snipers being remotely useful is Radar...
Edit: Sorry, here's the source.