What shocked audiences in 1969 and made the original "Wild Bunch" famous or notorious isn't going to work nowadays, after "Deadwood" and "Godless".
There still isn't much to be found about the new version, but apparently Gibson is producing, co-writing, and directing, and interview snippets indicate he is aware he needs to come up with his own angle. You can think of Mel Gibson what you want, but he has mastered his craft, so this could definitely be worthwhile. If it is actually happening. After an initial flurry of reports, there hasn't been much the last few years.