This is not a good way for Microsoft to begin the Windows Phone 7 update situation. The company had been criticized in Windows Mobile days of yore for allowing partners to determine if phones would receive an update. A common complaint of WinMo phone owners was that OS updates rarely made it to handsets after purchase due to partner refusal to provide them. WIndows Phone 7 was touted by Microsoft to change that, as the company remained in control of the update ecosystem. This minor update failure for some phones does not make Microsoft look very good to new WP7 owners.
Further sullying the WP7 update situation, Microsoft is admitting that carriers have the right to pass on any update. A WP7 support tech stated in a support forum:
Some Mobile Operators have the right to skip one update if they wish. However, they can't skip the next one, which would be an acumulative update and would include the previous one.
So if your mobile operator decided to block this one, you will be getting the early March one (which will include the Feb one too).
Microsoft first admitted that carriers could block updates right after launch, and while this is an improvement over the update process of old, it's not the same as guaranteeing WP7 owners will receive all updates. It is not a good beginning for WP7 in regards to customer support, and further proves how difficult a process OS updates can be.