Mike O'Brien, the president of ArenaNet, has posted on the official blog outlining the foundation of the microtransaction system in Guild Wars 2 and how it will work. It's one of the hotter topics that people tend to get very passionate about and it's interesting to get a better take on how ArenaNet intends to approach it.
"We think players should have the opportunity to spend money on items that provide visual distinction and offer more ways to express themselves. They should also be able to spend money on account services and on time-saving convenience items. But it’s never OK for players to buy a game and not be able to enjoy what they paid for without additional purchases, and it’s never OK for players who spend money to have an unfair advantage over players who spend time."
Make sure to stop by Guild Wars 2 Guru to express how you feel about microtransactions.