Sony "Odin". I have heard that it is a 5" device in the same size envelope as the current Xperia Ion. There are two SKUs in testing, one with OLED and one with LCD, the OLED is supposed to be RGB rather than shitty Pentile but Sony want to see how well it fares in comparison to LCD before going into full production.
Another area in which I have heard a lot of rumblings from Sony, HTC and some more minor OEMs is about updates. They are all unhappy with Google pushing down major 0.x updates just three to five months apart. They want Google not to push 4.2 before the end of the year because they feel that their phones currently on the market are instantly outdated and having so many updates penalises OEMs who make the commitment to keep the majority of their phones updated rather than just one or two top range SKUs.
Other rumours I have heard line up with 5 Nexii and Google relaxing the branding rules for Sony and HTC who flat refused to make Nexus devices if they can't push their services on it.