This just in: According to Darcie Baum's Twitter feed, the cover will be revealed on Thursday night.
This is way early, and I wonder if it's an effort to keep the cover from leaking. (Although it technically just forces any leaks to leak earlier...)
Sounds like SI and Letterman have parted ways.
And, this seems like the cover will be revealed before the last couple of rookies are, assuming one will be revealed Friday and on the following Monday.