Here Comes The Disposable Hard Drive
No word on what IBM/Fujitsu will do.
If you need a hard drive fairly shortly, probably would be a good idea to buy one before October 1.
Apparently, in the EU, they have to offer a minimum of two, but three is still more than two, so that would be a good idea in the EU, too.
If IBM continues with a three-year warranty, you may want to buy drives from them after October 1.