In the conference call, Kraft CEO Irene Rosenfeld had with Wall Street analysts, she mentiones several major synergy points of this  tie-up. 

These will be the preliminery  outcomes of this  acquisition, aside from financial and/or tax benefits, feel free to comment on them or add more if you like:

- Cadbury has more "instant consumption" channels like gas stations, cornershops which are well penetrated by Cadbury products in many countries ( also in Turkey where I live) wheras Kraft  is more concentrated on supermarkets and groceries where margins are lower, so  when they are together, overall distribution will be higher for both and the margins will increase,

- Cadbury has big business in some emerging markets like India, South Africa, Mexico and Turkey where Kraft is relatively weak or not existing; similarly Kraft  also has strong emerging markets like Brasil and China which will help to Cadbury products,

- There are complementary products, when two companies bring together their portfolio, in many markets they can enjoy benefits of a larger and well balanced products,

- The tie-up will generate the number one global confectionery player with 14,8% share  slightly above of Mars who has 14,6%...obviously scale matters.

Certainly, those synergies are all on paper now, if and when they can be activated time will show...