In addition to all the analyses you can read for yourself (google or follow link above) I have another point to make- The report, with its concrete guidelines will spur technology innovation in bringing down the cost of transactions. IT hardware as well as software exits to bring transparency which reduces corruption and automation to reduce cost/transaction (of the large number of small loans MFI must deal with that raise their costs) but so far the MFI industry has been somewhat tech-averse - it increases risk to take a technology and market risk at the same time after all. With industry benchmarks to follow I believe entrepreneurs as well as established MFIs will be motivated to enlist technology to develop applications specif to the MFI industry.
For a specific example of "technology to the rescue" check out the initial results of start-up Artoo. Sameer Segal, founder of Artoo writes "we truly believe we can help MFIs bring their OER down to meet the new requirements".
Mainstreaming micro-finance will also allow the industry to open up new product offerings (e.g. savings accounts) that further benefit both client and lender.