The Old NIV rendered verse 3:
For what the law was powerless to do in that it was weakened by the sinful nature, God did by sending his own Son in the likeness of sinful man to be a sin offering. And so he condemned sin in sinful man.
The New NIV says:
For what the law was powerless to do because it was weakened by the flesh,God did by sending his own Son in the likeness of sinful flesh to be a sin offering. And so he condemned sin in the flesh.
"Sinful nature" as a translation of "flesh" was one of the worst things about the old NIV. I'm very glad they've corrected that. Not least because they've stopped calling Jesus sinful in Romans 8:3. Which is good.
Also in verse 34 they make another change - what do you think about this?
Who then is the one who condemns? No one. Christ Jesus who died—more than that, who was raised to life—is at the right hand of God and is also interceding for us.
That opening question is expecting a negative answer. The old NIV does not have "No one". It goes on directly to speak about Christ Jesus who died. I suppose that has the advantage of communicating that the one person who could condemn you has infact condemned you at the cross in His own flesh. But the new NIV supplies the expected negative response so that no-one could get the impression that Jesus is the one who continues to condemn.
I spotted another interesting update when preparing for yesterday morning on Acts 2. The new NIV policy of gender neutrality is not comprehensively followed!
“Fellow Israelites [old NIV said "Men of Israel"], listen to this: Jesus of Nazareth was a man accredited by God to you by miracles, wonders and signs, which God did among you through him, as you yourselves know. This man was handed over to you by God’s deliberate plan and foreknowledge; and you, with the help of wicked men, put him to death by nailing him to the cross." (Acts 2:22-23)
Everything's gender neutral except responsibility for deicide!