Alright, Guild Wars 2 can be pre-purchased from here starting april 10th, and doing so will give access to all beta events and three days of early access to the game and a special item! Hit the link for all the details. 
There are three SKUs available: Standard, Digital Deluxe (with a few in-game goodies) and the massive Collector's Edition!
$150 is a bit steep for me though, but I want it... It looks awesome!
On the same page, you will also find the minimum hardware requirements for the game (though they are not necessarily final)! They are as follows:
- Windows XP Service Pack 2 or better
- Intel Core 2 Duo 2.0 GHz, Core i3, AMD Athlon 64 X2 or better
- NVIDIA Geforce 7800, ATI Radeon X1800, Intel HD 3000 or better (256 MB of video RAM and shader model 3.0 or better)
- 25 GB available HDD space
