Apple just released Security Update 2015-003 for OS X Yosemite 10.10.2. At the same time. there is an update for iPhoto, which should improve compatibility with the upcoming Photo apps.
As MacRumors reports, Apple has released an update to iPhoto 9.6.1 as well. In addition to bug fixes, such as the representation of Facebook albums or when printing images, to pave the way for iPhoto Photos successor the update. The iPhoto library is optimized here for the next photo management.
Photos will appear as part of OS X Yosemite 10.10.3. The new version, including Yosemite Photo app, currently in beta testing. It is planned to release in the spring.