An interesting article from Computer World UK offers more information about Google's support for ODF:
"Magnus Falk, deputy CTO for HM Government, told the audience that the decision to adopt ODF (alongside HTML and PDF) as the UK government's required document format is now well in hand. (...) As a result, Google faces significant pressure securing government business in the UK – including in the health and education sectors – now that ODF is a requirement. The support for ODF in Google's products is weak and uneven. (...) Chris DiBona, head of open source at Google, told the PlugFest audience that support for exporting ODS and ODT files in ODF 1.2 format (the one used by all modern suites including MS Office and LibreOffice) is now under development. He also said that support for ODP presentations was under development and could be ready as soon as summer 2015. (...) DiBona explained that Google's internal metrics suggest to product groups there is little use of the existing ODF facilities, but he admitted that may be because of both the poor quality of the import and export, the weakness of the viewer implementations (which fail to display many aspects of ODF documents) and the lack of integration of the collaboration mechanisms into ODF."