I'm cautiously optimistic about this one. I loved GW2, even though I haven't kept up with it in a while, so I'm interested to see what they are planning for the sequel. Orr also seems like a fun setting. I live the descriptions in GW2 of Orr pre-sinking. (Also, the gods (presumably) saying "we promise you magic" is funny, considering how horribly that ends in this case.)
However, GW2 is dripping in style, and I love the painterly style it has. I'm not seeing that same style in this trailer. It looks kinda generic, tbh. (The design of the mount is stellar, though.)
Also, being set in the past means that the Sylvari don't exist yet, and the Charr are still the "great enemy", so those two are out. We seem to have gained Kodan as a playable race, though (probably means no Norn as well, since they would have quite a bit of overlap). Also, this seemed like the perfect chance to give the people the Tengu they have wanted, but playable Tengu remains a dream, it seems.

Danish has essentially managed to shorten "four and a half score" to what would be equivalent to saying "half to fives" in English. So it would be "two and half to fives" if we were to do the same in English. (This is also kinda similar to how the clock is read. 8:30 would be "half to nine" rather than "half past eight", which is used in English.)