Nexus 5: buy now or wait for the Nexus 6?

Hello people of Googleplex,

here's my situation:

normally, my upgrade/phone changing cycle would end in September, but since yesterday my phone is kind of broken. So there are two possible ways now: deal with my broken phone until September (read: wait for the Nexus 6) or buy a Nexus 5 now.

Are there any clues/rumors about when the Nexus 6 will be released? I don't want to spend money on a Nexus 5 now and have Google releasing a next generation Nexus a month later...

Thanks for your help!