The big story in recent BeOS-related news was the addition of swap file support to Haiku (spotted on ICO, also picked up by OSNews).

This is especially good news for developers, as development-related tasks often gobble up large amounts of memory (compiling for one) – and without a swap file/partition, most (all?) OSes will hard-crash if they completely run out of memory. So while Haiku has been self-hosting for a while now, this should make the process of actually compiling Haiku from inside Haiku less dependent on physical memory (especially handy with virtual machines, which tend to be memory-constrained).