yup, its very possible newer versions of that slide have hit, but most of the ones we've seen do appear to be fake with odd fonts/number sizes.
If memory speed goes up from, 1200Mhz to 1500Mhz then we'd get a pretty big jump, question is, are the newer faster memory chips available yet. I did wonder if waiting on the newer gddr5 was a reason for any delay, its happened before with gddr4 and gddr5 dictating the release dates of AMD products in the past.
Though I also suspect we won't see a massive speed increase, doubling the density of the chips to 256mb per chip probably isn't going to allow a good bump in speed, probably see the existing 128mb chips get faster versions first so it might not be possible for a 2gb card.
Simd number doesn't help either, unless we know for sure it was staying at 80 shaders per simd, but with a change from 5 way shaders to 4 way, its very unlikely to stay at 80 shaders per simd, possible, but unlikely.