Yesterday, Tom (Lane) committed 9.2.0 to Fedora rawhide, and even better, to Fedora 18.
RHEL 7 is said to be based on Fedora 18 (also said here, too), so apparently we skipped 9.1 there, and the shiny new PostgreSQL 9.2 will be on RHEL 7. With its better scalability, I'm sure that RHEL 7 will help us to gain more ground.