For users with Hong Kong accounts, The Uncharted 3 Beta is live on the PlayStation Store. It comes in at a whopping 1627 MB. You will need PlayStation Plus to access it, so hopefully you made a Hong Kong account before the outage so you can redeem your free 30 days.
To locate the demo on the store follow these steps:
1. Select Featured Items on the left side.
2. Select the New Releases button.
3. You can find the beta in the second row.
If you want to know what is in the beta, check out the FAQ on the Naughty Dog site.