Real WiMax certified devices are not expected till at least Q4 of this year. That's quite far and the certification process is actually expected to start only in Q3 of the year. Note all those talking about "WiMax compliant devices" or deploying or testing WiMax devices are either misinformed about the actual status or are trying to mislead.
Link to article.
And now, here's a report about denial of such delays from WiMax forum !