Is there a recommended practice for marking devices which don't have and EOS date announced yet? I could ignore the devices, but with a device like the 6500-E chassis it could have a EOS announced soon.
It's really all about your own preferences.
For newer devices, personally I would leave the EOS dates blank. For devices where you feel a EOS data is due to be announced, you could put a fake date in for them as a trigger to make you check with the vendor, or simply use any other form of reminder to serve this purpose.
