To be eligible for accelerated examination, applicants are required to provide specific information, known as an examiner support document, so the USPTO can issue a final decision by the examiner within 12 months on whether their application for a patent will be granted.
Inventions that are new, useful, non-obvious, and accompanied by a written description disclosing how to make and use it, are presumed to be patentable. To reject an application, the USPTO must show that the invention is obvious or not new ("prior art").
Normally, applicants have to disclose to the USPTO relevant prior art of which they are aware but are not required to search for it. For accelerated examination, they must search for prior art, submit all prior art that is closest to their invention, and explain what the prior art teaches and how their invention is different.
They must state how their invention is useful and show how the written description supports the claimed invention. Only a limited number of claims is allowed in each application and the time for responding to most USPTO communications is shortened.
This and the peer review process (recently described here) presumably will improve the quality of patents issued. However, there is a good bit of skepticism among those of us at Against Monopoly who see the USPTO as overwhelmed and under the strong influence of existing patent holders and big business.
Keep an eye peeled.