all progress in the game will be lost after the pre-Beta?

Yes, your char will be deleted man.

Yes, but in the open beta your character will not be deleted.

Yes everything will be wiped out except cash points if you had them (cash points that you spend will come back).You should read game status before playing because many of people are asking this question these days.Anyway if you're new then you should know that the game is not done and main things in the game are not coded/tested yet so it'll be more interesting to play in Open Beta.

Good Luck.