Moscone Center in San Francisco.AppleInsider is reporting that Apple may have already locked in dates for WWDC 2010. A calendar listing at the Moscone Center in San Francisco shows a “Corporate Event” from June 28th to July 2nd, a name that has designated Apple events in the past.

The date also coincides with the launch of the original iPhone. Since that launch, Apple has made major iPhone announcements at each consecutive WWDC. The rumor this year is that we’ll finally see the phone make the jump to multiple carriers in the US, though it’s not clear who that could be. Most people think Verizon, but the CDMA standard is not exactly iPhone friendly. T-Mobile would be a much easier choice, but it’s also much smaller.

You can’t make mention of WWDC without bringing up the iPhone SDK conference that happens some time in March. Think we’ll see OS 4.0?