I've steered well clear of the latest round of ITK stuff. To be fair, the ITK stuff whether he is coming or not I have tended to avoid commenting upon. It's hard to prove or disprove much either way. When I have seen journalists clearly speculating on whether Usmanov was not coming here (or going to other clubs such as Milan, Charlton or Newcastle as many suggested and have been proven wrong).
Alongside that I have taken rumours on forums with a bit of a pinch of salt, but do factor the broad picture they illustrate.
One thing that keeps cropping up seems to be around his step son. Supposedly he has an office at Everton HQ (which hasn't been disputed from what I can see).
I was always a bit wary as to whether Usmanov would formally come on board. His son coming on board would make a lot of sense though, as Usmanov would likely want to have representation at the club but would not likely to be himself.
If it happened it would be very good for the club. It would likely tie the Usmanov wealth is passed down when he passes on and would hint at a far longer term involvement. I believe it's his only son so is likely to inherit all of the fortune. Having him cutting his teeth at Everton would be a big positive for me.