This is an interesting read. I personally was not aware that Google was using MySQL for some of their backend, non-search related systems. I think it is cool they are contributing their enhancements back to the MySQL community. The code they are contributing include enhancements to high availability and manageability.
Personally, I was hoping that the enhancements would have included fixes to the transaction engine that has plagued Sakai of late. I still hold out hope that these transactional issues are cleared up at a very low level so that we do not have to perform backflips and handstands in the application code itself.