FUD Zilla also wrote this morning that GeForce GTX 560 and GeForce GTX 570 may arrive later this year. These cards are based on a tweaked GF104 GPU and entry-level GeForce GT 520 and GeForce GT 540 cards should follow in 2011.
After a few months there should be a Geforce GT 540 and 520 cards for the entry level but they are almost certainly aiming for a 2011 launch.
Decisions on whether to launch some chips or not are changing almost on a daily basis, so the Geforce GTX 560 might also launch in 2011. It is up to Nvidia to figure out what to do with the GTX 460, which is doing quite well. Price drop perhaps?