I just don't know, tbh. I am a sucker for every Nexus phone that Google puts out and for that reason it is on my radar. But I'm not sure how I would manage such a large device on a day to day basis. My other half uses a Lumia 1520 (wonderful phone), but I always feel phablets are more manageable for women, who almost invariably carry small bags with them everywhere.
My other niggling problem is that there is a distinct whiff of 'Plan B' about this device. The mock-ups and reports suggest a GPE (or Silver, if you like) type device that has been re-branded as a Nexus. While that isn't the biggest problem in the world (and the specs certainly sound top notch), it detracts from the Nexus brand as its own thing (imo); something cooked up specifically by Google. The Shamu leaks, superficially at least, give every appearance of Google passing off Motorola's homework as its own.
That being said, I can seldom resist the draw of a Nexus device and I imagine I'll still be there on the Play store come launch day, for both this and the Nexus 9.