I received an email from Entertainment yesterday offering me the 2005 book now. I clicked on the link to their site; 2005 books are indeed "orderable" now, but whether they are actually shipping varies by area (as example, the ones for Orlando are already shipping, but those covering my area in New York aren't scheduled to ship until late this month).
Also, be aware that using Entertainment to make hotel reservations can't be done more than 330 days out, so those (like me) who are planning to make reservations through them for Universal hotels for mid summer 2005 (or later) still have to wait for the "advance ressie window" to open.