This is a really great update!
Here's what could be the icing on this cake:
1) An option to automatically load the correct Impulse curve for the amp when an IR is selected. So, basically, each IR would also have the authentic impulse curve associated with it, which takes effect automatically within the amp block.
2) A solution so that customers and IR cab-pack makers could precisely and easily measure these Impulse curves of their own cabs while capturing IRs, and save them with the IR's they capture. Or at least save them in some way that the Axe FX can read/load.
A tiny new fractal measuring device people could buy, I assume?