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Where'd you pick up this gem of information? I can't find anything else on it, with a quick scan. Is it April in Alberta?
Maybe you just need a new Google machine... this has been in the news for some time now.
When the D4 was announced, one of reasons Nikon gave for the new, lower-capacity batteries for that camera is that the old batteries could no longer be sold due to new Japanese regulations limiting battery capacity. The fact that the current EN-EL3e batteries are also banned under these the new regulations was announced several months ago, and this probably sped up Nikon's timeline to discontinue these models.
None of the new Nikon batteries will be backwards compatible with the old cameras or chargers or anything else, and I'm just wondering if the same thing will happen with Canon's batteries.
Oh, and here's a link to the D700 and D300s being discontinued, which took all of 0.014 seconds to find...