Android M Nexus 5 boot loop As soon as I got home after the Android M image was available, I (of course) flashed it to my Nexus 5, following all the usual procedure (e.g. wiping Dalvik and Cache). Now it's been stuck on the flying dot sequence for a long time (20-30 minutes). Has that happened to anyone else?
I'd be willing to bet you need to do a factory reset, not just a wipe of cache. Generally that's required for the preview images, and if you don't, you end up with exactly what you just reported.