I believe that there are no abrogation in the verses of what we have now of the holy Quran.... the forgotten verses been removed from the human memories.
And the abrogated verses also been forgotten and altered with a better verses thus removed it from the Quran. Quran is a Fully integrated texture now and every different verse of it have it's special way in interpretation when we have the sense of the Quranic understanding...
giving you an example about alcohol drinking:-
1- Verse (16:67) "And of the fruits of the date-palm, and grapes, whence ye derive strong drink and (also) good nourishment. Lo! therein is indeed a portent for people who have sense".
this verse doesn't points that alcohol are allowed, because Allah almighty said after the strong drink AND a "good nourishment", not promoting the strong drink, but showing that he created things for many uses, and can be used for good and evil and medical stuff.
lets take a look at Isaiah 45:7(KJV)
"I form the light, and create darkness: I make peace, and create evil: I the Lord do all these things"
2- Verse (4:43) O ye who believe! Draw not near unto prayer when ye are drunken, till ye know that which ye utter
this verse also doesn't point that Alcohol were allowed or are allowed, it points that if it happened and your brain got intoxicated by these stuffs, then don't come to my mosques and don't pray at all.
And Allah almighty knows best.