...Also, there's no hard evidence we are still getting a GDR2 update for 8.1 at all. :/ ...
I wouldn't get excited about the processor just cause its 64bit. It was still slated to be a low powered 410 and only 1GB RAM.
People don't really notice when Apple came out with a 64bit mobile device, they quietly increased the SoC memory throughout. Everybody assumed it was the magic 64bit processing when it wasn't. It was an upgraded processor all together.
Also, there's no hard evidence we are still getting a GDR2 update for 8.1 at all. :/