I'm also confused as I bought my DS3P from OcUK last week. The box has the 1333FSB sticker and a sticker saying Rev 3.3 (I checked the other day), but the manual says Rev 2 and CPU-Z says Rev 2. I haven't been able to check the back of the board itself yet as it's now in my case, but I've got to take it out soon to fit my new Freezer 7 Pro.
Could it be that Gigabyte changed the boards but didn't bother reprinting the manuals or changing the Rev number programmed into the board? It would be good if OcUK could have a look at a boxed DS3P in their stock and maybe ask Gigabyte direct. If they're selling Rev 2 boards in boxes that state Rev 3.3 they would be inadvertently breaking the Sale of Goods Act through no fault of their own. That's certainly an issue they would want to take up with Gigabyte.