Well, right now I can only think of Electri6ity. It's a new guitar VI by Vir2, and Vir2 will have a new page for this new VI up and running soon.
Not sure when it will be released, but Vir2 claim it uses some new advanced morphing capabilities that allow for a very wide dynamic range and seamless articulation and legato.
We'll eventually find out if their claims are indeed true or not when the time comes. And and they should really do a bass with their new morphing technology, otherwise we are left with a guitar but no bass. I'm not really sure if that makes much sense. Unless you're a bassist ;-)
Of course, the virtual guitar to REALLY beat is the one being developed by Mokafix Audio which uses pure physical modeling and sounds very much like a real guitar or a bass, depending on what gauge strings are used in the implementation of the physical model
As to when THAT is released, well, I have no idea, but perhaps I could just say I hope before the end of this new and very much unfinished year.