Nope, the 500 series kept the same Fermi architecture as the 400 series but there are a lot of differences, I realise a lot of people don't find this as interesting as I do so I'll keep this brief but the changes were as follows:
GPU clock upgrade from 675MHz to 820MHz
Number of stream processors increased from 336 to 384
Tesselation units increased from 7 to 8
Texture units from 56 to 64
Memory clock increase from 900Mhz to 1GHz leading to memory bandwidth increase
Memory bandwidth increased from 115GB/s to 128GB/s
Also worth noting is the 560ti draws 20 more watts than the 460. I could compare the 460 to the 560 non ti edition but that was actually a revision of the 560ti with one less functional core to save on manufacturing costs. The non ti 560 is still clocked higher than the 460 and still outperforms it - Nvidia would not release a new GPU series with only an advantage in power management, it's suicidal in todays graphics market.
When AMD released their latest line they have managed to reduce power consumption massively but they did so through reducing fabrication to a 25nm process, they still made faster, more powerful GPUs, it's too competitive at the moment for either company to release cards that don't advance performance in some way.
