I think there are some compelling reasons for the Equus to include the 5L Tau as well as a horizontal grille. It's doubtful that the 5L would be much more expensive for Hyundai to produce given the development costs are already complete, and it would allow those costs to be spread over more units. When other manufacturers increased displacement - Camry 3.0L to 3.5L Lexus LS430 to 460 etc. - prices barely changed (at least due to the displacement increase). Also, the 5L would help differentiate the Equus from the Genesis and, more importantly, from its main target the Lexus LS460. While the Genesis has had many reviews, there have been few direct comparison tests (there was one with the Genesis 4.6 pitted against a Lexus GS 350). But the Equus will be tested against the Lexus LS at the very least. Those comparisons will do a lot to shape perceptions and the 5L could help tip the scales in favor of the Equus.
In terms of the grille, Left Lane has some spy shots of the 2011 Genesis and says it will include "new signature styling on the grille which will give an immediate tie-in to the Equus flagship".
http://www.leftlanenews.com/hyundai-genesis-sedan-2011.html So the 2011 Genesis will have some type of center
badge. Let's hope it's not the flying H. Given that the grille is arguably the most important styling cue on new models - think Audi, Acura, BMW - it makes sense for Hyundai to unify the grille for its top models. Hyundai has been doing a lot of things right lately. Let's hope they continue.