Guild Wars 2

If I pre purchase HoT from gamestop will i still gain access to beta weekends?

Yes.

As soon as you apply the purchased code to your account, you will be eligible for everything; pre-purchase bonuses (including deluxe/ultimate items if you bought that one) and access to all upcoming beta weekend events.

I don’t think you will see a beta slot appear instantly, but check on August 7th-10th to see if you are given 4 beta character slots at the main menu character select. If not, then contact support.

Yes as long as you have a beta slot.