ramasule & all
There is a sme8beta4 iso (CD image).
There are also sme8beta5 updates available only at this stage as a yum update from smeupdates-testing repo. Anyone testing sme8beta4 should do the yum update to get the latest rpm packages and be testing those rather than earlier released versions.
See
http://wiki.contribs.org/SME_Server_8Only on a sme8 server do
yum update --enablerepo=smeupdates-testing
signal-event post-upgrade
signal-event reboot
sme8beta5 has the samba version that supports Windows 7 Domain login, which has been an issue for people recently, plus other fixes etc.