Interesting that Bordeaux, stuffy and conservative as it is, is engaging with Marselan.
FYI, here's a Bloomberg article on it. http://www.businessweek.com/lifestyle/miracle-marselan-a-marvelous-new-varietal-09092011.html
where the author alludes to Marselan as adding a 'cheerful vivacity' of Grenache to the sturdier Cabernet Sauvignon.
Corollary story: about two or three years ago I was having a rather lovely dinner in Sonoma with two very prestigious Bordeaux winemakers (Directeur de Techniques) and in our wide-ranging discussion of all things vinous, both gentleman assertively stated that the one grape they would love to see in Bordeaux's pantheon of allowed grapes is...Syrah.
They felt Syrah would be a wonderful blender for the wines of Bordeaux. I will admit I was a bit shocked when two such winemakers form such august chateaux made this statement so forcefully and without hesitation.
Now we have the Cab Sauv/Grenache cross, which is apparently seen as quite successful in Bordeaux, even though it was originally developed for the Languedoc, and all who have tasted it apparrently agree on the brambly and vivacious aspect the grape brings to a blend (or on its own varietal statement).
Looks like a grape, and a trend, worth watching.