Copio incollo brutalmente da [1] PhotoshopNews:

Note: at the time of this posting on Thursday, December 14th, 2007, the links includied in this story are not yet alive. It is expected that the [2] http://labs.adobe.com/technologies/photoshopcs3/ will be live sometime in the early morning of December 15th, Pacific time. Keep checking the links and be aware that the Photoshop CS3 Public Beta will be a LARGE download with the Macintosh version being about 684MB in size while the Windows version will be 355MB in size. These downloads include Adobe Bridge 2.0 beta as well as an alpha version of Camera Raw 4.0.

Nella mattinata, per noi pomeriggio del 15 Dicembre rilasceranno la beta pubblica di Photoshop CS3; nel download saranno compresi anche Bridge 2.0 e Camera Raw 4.0.
Nel pagina di [1] PhotoshopNews ci sono delle FAQ, per cui se siete curiosi e volete saperne di più, vi consiglio di leggere con attenzione.
Aggiungo solo poche cose: la beta è solo in inglese, ovviamente, ed è per tutti coloro che hanno una licenza CS2.
Sarà valida fino all’uscita in primavera della versione finale. Adobe non fornirà alcun tipo di supporto per questa versione beta.
Infine i requisiti di sistema, per entrambe le piattaforme:

Macintosh
PowerPC® G4 or G5 or Intel based Macintosh processor
Mac OS X v.10.4.8
320MB of RAM (512MB recommended)
512 minimum of RAM if you are running Adobe Bridge as well
64MB of video RAM
1.5GB of available hard-disk space
1,024×768 monitor resolution with 16-bit video card
DVD-ROM drive
Internet or phone connection required for product activation
QuickTime 7 software required for multimedia features.

Windows
Intel® Pentium® 4, Intel Centrino®, Intel Xeon®, or Dual-Core Intel Xeon processor
Microsoft® Windows® XP with Service Pack 2 or Windows Vista™
320MB of RAM (512MB recommended)
512 minimum of RAM if you are running Adobe Bridge as well
64MB of video RAM
650MB of available hard-disk space
1,024×768 monitor resolution with 16-bit video card
DVD-ROM drive
Internet or phone connection required for product activation
QuickTime 7 software required for multimedia features.

Oyasuminasai (おやすみなさい).