I've been hit by a bit of news from a friend that first scared me: updates to the DnD 4th Edition core set of books.
It immediately brought back memory of the painful "3.5" edition books that came up not so long after I had purchased my "3.0" books.
I took a quick look at the changes in the Player's Handbook (I don't own / am not familiar with the others) and found that there were all simple changes, and fixes. In fact, I took note of them on post-it notes which I spread all around my 4th ed PHB.
Not much to report on the changes; they all are details about rules, adjustments in wording - even an omission as to which attack vs defense stats to use with a power. None of these changes would warrant a "4.5" edition book - though they could (and should) be fixed in ulterior prints. Who knows, maybe they will print a 4.5 edition with these changes. But so far, there wouldn't be any need to purchase them if you have the ones that are out now :)
You can fin the changes in here: http://www.wizards.com/default.asp?x=dnd/updates
