Found myself on the subway a lot this weekend. Every single E train was the one with the big blue E circle in the front (as opposed to the usual little E on top of the train).
Could be that they just take the regular E's out of service on the weekend to clean and maintain them, but maybe it's some kind of test for the new R160 E trains which are rumored to come as early as Spring 2009. I'm not a train buff but common sense tells you the overcrowded Queens Blvd line deserve some kind of new train. But the MTA is not in the common sense business (Fulton Street Station).