OPA2197

Has anyone heard of this op amp?

  http://www.ti.com/lit/ds/symlink/opa2197.pdf

Datasheet doesn't say much about audio, it's mosfet input and the example app is all about data acquisition and such. But unless I'm missing something this looks like a pretty great amp:

1mA / amp quiescent current
+-65mA output
very low offset
low noise / distortion
wide supply range
xtra input protection / emi filtering / thermal protection
lots of different packages with 1, 2 and 4 amps
drives capacitive load
high Z input
rail-to-rail diff input range using complementary mosfet input pairs
no phase reversal

One OPA4197 could make a very good battery powered headphone amp.

It is $3 though. And it looks like it needs supply bypass caps at the pins so it's not a drop-in replacement for TL0X which is the standard low power high Z amp.

The LM4562 has lower noise voltage (and perhaps lower THD) and it is cheaper, but for a FET opamp it has very good noise voltage spec. Like you mention, it could be a good replacement for the TL07x

OPA2197 is 1mA / amp quiescent current, +-65mA output and 25uV offset. LM4562 is 5mA / amp, +-26mA and 100uV. So they're really quite different in wrt these params. Noise and THD are important to a high gain amp like a mic pre. That's not where this shines. OPA2197 looks like it would really be good for something running on battery that can directly drive a load without blocking caps. So headphone amp or a DI with an impedance balanced output comes to mind.