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?

iPhone Nano rumors started to resurface this week, based on photos from a manufacturer and supposed insider reports that Apple is working up a device for Verizon’s CDMA network.

The rumored device would sport a hybrid UMTS/CDMA radio, making it compatible with pretty much any network. The screen is down from 3.5 inches to 2.8, which seems way too small to me. Granted, there’s always zooming to get to hard to read text, but there’s really nothing worse than scrolling a page around while you’re trying to read.

Speculation points to a 2010 release, which would make sense considering the massive Android rollout that has been taking place. As Android makes it onto more devices, particularly cheaper ones, Apple’s going to want a way to get those entry-level smartphone owners. A smaller iPhone might not get those folks, but a cheaper one definitely would.