You can find the Beta Release download under http://www.oracle.com/technetwork/database/express-edition/11gxe-beta-download-302519.html

That the new Oracle XE 11.2 is now available for Linux 64bit is really a good news :-)
Following Linux 64bit Operating Systems are officially supported with the new Oracle XE 11.2:
- Oracle Enterprise Linux 4 Update 7
- Oracle Enterprise Linux 5 Update 2
- Red Hat Enterprise Linux 4 Update 7
- Red Hat Enterprise Linux 5 Update 2
- SUSE Enterprise Linux 10 SP2
- SUSE Enterprise Linux 11
What is new in the Oracle XE 11.2 limitations, that you can store now up to 11 GB user data as before in Oracle XE 10g only 4 GB. The 1 GB limitation of the SGA still remains :-(
Enjoy the testing of the new Oracle XE 11.2 Beta Release :-)