EVE Online has a short announcement about a small patch set to go live today:
Tranquility will undergo an extended downtime on Wednesday, 20 February. The start time is 11:00 GMT and the length of the downtime is expected to be three hours. During this time, a patch will be applied to Trinity consisting of one fix to correct the problems caused by the Trinity 1.0.2 patch.
Here are the patch notes:
An issue has been resolved which caused some clients not to be able to connect due to an Incompatible Protocol error.
If you haven't logged in yet today, you may want to do so to grab the patch.