As things stand currently it hasn't changed much. I was lucky enough when I did my character copy to have a couple of high ilevel pieces in my bag than what I have equipped to see the difference.
1. ) Equipped the legendary boots, they were 50 item levels higher than my current boots. I lost somewhere around 2% crit changing them. It seems to be a decent DPS gain, which honestly it should be with that much difference.
2.) I had a cloak that was 10 ilevels higher, still had crit on it but not optimal. With the boots on it cost me roughly another 1% crit dropping me to 47%. It was a DPS loss.
3.) Tried a couple of different trinket combos. One with crit but a lower ilevel ( was using an 850 plague swarm to start) and it was a DPS loss, so the extra crit didn't overcome the power of the haste + proc. Second try was an 860 starlight, so 10 ilevel difference, but mastery instead of haste, it was also a DPS loss which I figured it would because it is currently.
So basically atm on PTR we are still roughly where we are at on live, however in extreme cases ( I'm going to guess 20+ ilevel) it may be better to go with the higher ilevel because Int and Crit probably are closer, especially in cases where that piece still has Crit on it. Trinkets as always are an outlier. I'm guessing rings and necks you would still go with optimal over ilevel because they do not have Int on them to make up the difference.
Obviously this is just what I have seen in my brief testing, I am in no claiming it is an indication of what the actual results are or will be.