Getting the "best images" is meaningless without knowing what you plan to do with the photos -- basically, why do you want to do this? Traveling around the world for a year is a wonderful opportunity, but it's totally different than going to a single location and shooting, say, advertising photos of a major resort center.
Do you want to sell the photos as stock? (Anything you shoot has already been shot a thousand times and is widely available often for free.) To sell huge fine art prints in a gallery? (Might require MF gear. Will likely require huge time investment in each location. Not a bad reason, though.) To illustrate your travel blog? (Use a cell phone or p+s camera.) To document the lives of people around the world? (Also a good reason, but probably better shot with more discreet gear.)
Is this trip solely for the purpose of photography? If so, then it's a job, and carrying the appropriate gear is fine. Or is this trip more for personal reasons, and photography is a smaller part of it? In that case, I would worry that a huge camera system would become a liability -- you will have to constantly worry about the security of your camera, and probably have to carry it with you everywhere. In that case, a digital MF system might be a bit large. (Also, what happens when your camera needs repair?)
If I had to travel the world for a year, and money were no object, I would get a pair of M9 bodies and a handful of lenses, a bunch of spare batteries and memory cards, and just shoot. For the kind of photography I enjoy -- basic photo-J stuff, people, portraits, street -- it's the perfect system. I can carry the whole kit with me in a small backpack or bag, and a travel tripod will easily handle the load for nighttime shooting. A 13 inch notebook computer will let me edit as I go, and I can upload to Photoshelter as a backup.
Given that, for me, money is always an object, in reality I'd take my GF1 and the 20mm lens, and buy a G1 and a couple of the zooms, and just use the m43 kit for this sort of thing. But again, that's for my kind of photography, not yours.
Good luck. This is a great opportunity for personal and professional growth. Hope you enjoy it.
--Ken