I was having a quick look through Yarlen's beta feedback thread and noticed something. The minimum system reqs have gone up for Rebellion. Specifically processor requirements.
I run Sins on a 2.2 Dual core fine and smoothly no problems at all (this leads me to suspect that I won't have any issues). But the requirement is for 2.4 in Rebellion. Usually expansion packs don't change the SRs, so why do they here?
I'm not actually in the beta yet (waiting for PayPal and the weekend), and wanted to check this out first.