Looks like Sony is releasing a QOL device that analyses your sleeping data in the cloud.
But really, if it *is* a new handheld I'd expect it to be an iterative extension on the Vita like the New 3DS. Sony simply doesn't have the resources to do a whole new platform launch with Neo and PS VR on the agenda, and the amount of money it'd cost to launch a whole new platform with its own new storage medium and marketing and so on just wouldn't be worth it.
But if it is a new PS Vita model, it could either be a form factor update, like the Vita-2000 or 3DS XL, or it could be a more powerful "New Vita" using the same hardware architecture like I mentioned earlier in the thread, complete with its own chassis update too. Much like the New 3DS was.
But for it to be a reality, developers would have known about it for a while now like they have NEO - they need to have some sort of hardware spec to target for their upcoming Vita games or cross platform ports, and we'd have heard about it until now. So I say it's unlikely.