Will people be allowed to eat meat in the new system?
That is a great question.
In Isaiah 11:6-8 it speaks of a our new system in regards to animals. Â It talks about returning to the original condition of the Earth, which animals were in subjection to man. Â It says:
The wolf will reside for a while with the lamb,
And with the young goat the leopard will lie down,
And the calf and the lion and the fattened animal will all be together;
And a little boy will lead them.
 The cow and the bear will feed together,
And their young will lie down together.
The lion will eat straw like the bull.
 The nursing child will play over the lair of a cobra,
And a weaned child will put his hand over the den of a poisonous snake.
So we can also look back to those original conditions to provide more clarity, and at Genesis 1:29-30 reads:
Then God said: âHere I have given to you every seed-bearing plant that is on the entire earth and every tree with seed-bearing fruit. Let them serve as food for you. And to every wild animal of the earth and to every flying creature of the heavens and to everything moving on the earth in which there is life, I have given all green vegetation for food.â And it was so.
So, yes understandingly it seems that Jehovahâs original intention was for man to live among animals, and live off the vegetation of the land - fruits, vegetables, legumes, and grains, and not off the flesh of animals.
In fact only after the great flood did Jehovah permit Noahâs family and descendants to eat animals as part of their diet, Genesis 9:3-4:
Every moving animal that is alive may serve as food for you.  Just as I gave you the green vegetation, I give them all to you. Only flesh with its lifeâits bloodâyou must not eat.
However, one scripture to note is Isaiah 25:6, which give further prophesy regarding the new world:
In this mountain Jehovah of armies will make for all the peoples
A banquet of rich dishes,
Of rich dishes filled with marrow,
Marrow is a rich, fatty, and protein dense meat found in the bones. Â
It is reasonable to have faith that all conditions of Jehovahâs original intentions of the world are going to be restored, and manâs diet will most likely consist of the abundant vegetation the Earth produces. Â Man will have in subjection the wild animals. Â And in regards to Isaiah 25:6, the Insight Volume 2, indicates marrow is symbolic, "Jehovahâs banquet for all the peoples, therefore, fittingly includes symbolic âwell-oiled dishes filled with marrow.â -Â indicating incredibly rich and dense spiritual food.
However, while the research was done thoroughly, new light may be yet shed on the matter to provide more clarity or new brightness - Proverbs 4:18. Â Only Jehovah will decide what we will be able to enjoy in his new system.
Please visit jw.org and use the watchtower library for more research.