While talking in an IRC channel on irc.winbeta.org, it was discovered that Microsoft has Officially released Windows XP SP2 RC2 as 2149. And for that, i bring you the link :)

Update: We now have the Express Install -m0rph

ChangeLog

Windows XP SP2 RC2 2149 English Windows XP SP2 RC2 2149 German

Express Install Windows Update