Guild Wars 2

I’m still digesting the trailer.
I think I will be happy to play this expansion if it is exploration focused and if the maps are that big as it was suggested.
I have some questions though that I would love to have a reply to from the devs at Anet.
That would help me making my final decision and make up my mind about why this expansion is really worth it.
1. There are 5 maps…. ok, how big compared to the HoT maps will the PoF maps be?
How much content is in there compared to the previous maps?
2. Mike O’ Brien is saying that PoF can be bought as a stand alone game, not requiring the previous parts of the game. Does that mean that we will get an introduction story for the characters that start in PoF from level 1? Like for example in Gw Nightfall..
3. Will we have a branching storyline that makes us taking decisions and makes it worth to replay like the original Gw2 story was?
4. Will we be able to use the mounts also in the other maps?
5. Will the bounties be added also to the core game for the people that own PoF?

And finally: Why still no Tengu or a new race??