well, guild wars 2 can be pre-purchased from April 10, which guarantees you a place in the beta events as well as a 3 day head start when the game is released.
Prices are on their site though being in Australia im likely to pay and extra $20ish.
And they have set some minimum system requirements though they are subject to change
* Windows® XP Service Pack 2 or better
* Intel® Core™ 2 Duo 2.0 GHz, Core i3, AMD Athlon™ 64 X2 or better
* 2 GB RAM
* NVIDIA® GeForce® 7800, ATI Radeon™ X1800, Intel HD 3000 or better (256MB of video RAM and shader model 3.0 or better)
* 25 GB available HDD space
* Broadband Internet connection
* Keyboard and mouse
at the moment nothing my laptop can't handle so I am definitely buying a copy
more info can be found on their site including what comes with the collector's edition.