In a new live Letter from the Producer video Q&A, Final Fantasy XIV: A Realm Reborn producer Naoki Yoshida touches upon the differences between the Dragoon and Monk jobs in the game. Says Yoshida:
Dragoon is your standard damage dealer. However, by attacking from behind or from the side of your enemy you will get bonuses and buffs. These bonuses can stack and enhance your damage. Also, when you talk about dragoon, of course you can’t forget their jumps, and in ARR we will have a variety of different types of jumps. You can use jump to get close, leg sweep to stun, and then run behind them and attack with a multitude of abilities.
In regards to monk, which is a close range damage dealer like dragoon, using your first ability or weapon skill will determine a "form" which will then determine the next weapon skill you can use. Additionally, you will want to use the featherfoot/haymaker actions while continuing to link the forms together. You will also have to worry about your positioning, so all in all, it’s a very busy role!
Depending on the form you can receive a haste effect which will reduce your global cooldown, so by linking a bunch of forms it will really open up possibilities. On the other hand, if you miss-link a form, you will have to start all over from scratch. It’s a class/job that takes a lot of skills to master!
You can watch the full Q&A video in which Yoshida fields a number of questions above, or read an English transcript of it here.