With an Android M release confirmed for Q3 and Nexus rumors flying around, we should see a new Nexus phone (or new Nexus phones if rumors are accurate) arrive sometime before the end of September. That's not confirmed but the rumors are exciting nonetheless.
Nexus 2015 rumors point to a large Nexus 6 successor from Huawei and a Nexus 5 2015 from LG. Both devices are intriguing and given the close proximity of the Android M release, they're probably worth waiting for. Especially if you're still a fan of vanilla Android and the Nexus series.