No info. But hopefully the first one will be based on Ubuntu 14.04 LTS and will be 64-bit (Cortex A57 and Cortex A53 class chips). It would be a mistake for them to start out with a 32 bit version, just to switch to the 64 but version months later or a year later.
One concern is that Ubuntu is probably shaping up to start rolling release and Wayland support in 14.10, and they face a current real issue of dealing with X in the embedded space. If the launch the phone with 14.04 (though, they don't have much of a choice if aiming for an H1 release) they end up ripping out the graphics stack half a year or a year later if they use X.
And there are still those awful rumors of Canonical writing their own windowing server and compositor. They spread themselves so thin sometimes that you rip the bread apart.
I doubt that they would be using such bleeding edge SoC if they want to aim at first half of 2014. Heck, best info I found was that the chips themselves are going to begin shipping in 2014. And building a phone around a brand new SoC will take longer than 6 months, even if they had a established OS (which they don't).
