I just cancelled IAH-MCI for a flight today not because of outbound weather, but coming back to IAH tomorrow will be very risky.

They are calling for freezing rain beginning after midnight tonight and throught most of the day tomorrow. CO customer service (as of 10:00 am CDT) said no re-booking notices have been posted for IAH yet but he expeected something by afternoon.

All you can do is wait and see, I guess.