Rumor for ICS

Yep it's probably going to be soon. But you really don't need to go back to EL29. Just flash whatever build version is released as the OTA and you're all set. No need to take OTA updates if you're already comfortable with flashing your device.
 
I agree with Jay. Plus, you'll keep root by flashing the update rather than losing it by accepting the factory ota. who knows if root will be achieved with ICS when it's pushed to devices.

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I would hold off on reverting back to EL29 because almost every ICS rumor says it's "coming soon" or "right around the corner" and I'm not going to believe anything until I see an article saying it's out right now.

It doesn't really matter to me though since I've been running an ICS ROM for quite some time now.