> With this release of MorphOS, can I use 2GB of RAM or am I still stuck
> with the 1GB barrier on my Peg II?

You were already told in that thread that the 1 GiB barrier with most (including your) Pegasos II board revisions is a hardware/firmware limitation and has nothing whatsoever to do with MorphOS or any other OS running on the board.
The 1.5 GiB barrier of MorphOS, which has nothing to do with the aforementioned 1 GiB barrier of the Pegasos II's hardware/firmware, is still there in MorphOS 3.0, regardless of the hardware it runs on.