Magazine cover image (note red bracchidios) http://i19.photobucket.com/albums/b180/jrgaf/7a22740f.jpg
compare with green bracchidios http://images4.wikia.nocookie.net/__cb20111020095625/monsterhunter/images/thumb/b/b7/MH3G-Bracchidios.png/380px-MH3G-Bracchidios.png
Looks fake. They've just used the White Lagiacrus* render and one of the Bracchidios renders**, and spray painted them different colours.
Besides, we've already had the 'bring everything together' game of the third generation; it was Tri G. It's not impossible that Capcom might churn out another to drag a few million more coins out of the population, but it seems a bit extreme even for them.
my thoughts exactly, but i wasn't an expert on MH3G (nor any MH titles), so i threw it in here. --- pardon if my posts suck, i post by tapping on the handset button on a one-way analog handset. i saw Hannibal Lecter do it.