Yes there have been some benchies already. I'll look later today If I can find them again.
Anyhow, the big picture was like this: both the new cards from NVidia and Ati perform very very nice, but they hardly outperform the current cards in the current games. Only at very high resolutions, high (FS)AA and with special tests they can show their powers.
If you have a card that satisfies your needs for the time being, better keep it and wait a little longer (and go with a PCI Express cards in half a year or so).