In a separate announcement Feedly also said that in response to user feedback it was placing the creation of its own Windows Phone 8 and Windows 8 apps on its roadmap for the rest of the year.
Nextgen Reader and Feedly's own app are likely to be one of a number of options for current Google Reader users on Windows Phone. Many of the popular Google Reader powered apps for Windows Phone are announcing or have announced updates that will see apps continue to operate even after the shut down of Google Reader. For example, the NewsSpot app from Fourspot will be getting an update that will support multiple sync engines.
Other options include apps that already support, or are powered by, alternative RSS reading engines. For example, Metroblur is a Windows Phone client for Newsblur, one of the RSS services that is frequently cited alternative to Google Reader.