Some stuff that leaked a while back that isn't confirmed for the album:
^Pretty sure that's T.I. doing a reference track for Dre to follow when he raps on that beat. Like on his last album, Dre's gonna have some big name rappers ghostwriting his lyrics on Detox. Jay-Z, Eminem, Lil Wayne, Drake, T.I., are all apparently writing. Possibly co-produced by DJ Khalil.
Another one with T.I.:
This is just my opinion, but it sounds like Jay wrote Dre's lines on Under Pressure, which isn't a stretch at all.
Larry, Dre's been my favorite rapper since kindergaden. lol
If he is trying anything new, its matching the tempo of the beat...which I think was a colab and not solely Dre's. Plus, if Dre doesnt speed his vocals, he'd never match Jay because they have differing accents. Remember how he switched up for "Forgot about Dre" to match Em?...but on "Still" he was slow... Sounds exactly the same to me....I have everything from before NWA up until now and yea, nothing is jumping out as HOLY SHIT NEW.
Em wrote Dre's stuff on Forgot about Dre. If you see him trying to match a rapper's flow on a song he's doing with them, it because they probably wrote his lines and gave him a reference track to copy when he rapped.
His voice and and flow on the part after Jay's verse jump out at me as a change.
BTW, I'd make fun of you for having a producer as your favourite rapper, but... Kanye West, hehehehe. I can't :D.