The word "sorting" has following different meanings:
1) to find a solution
2) to organise
3) to punish someone
So when you say "We'll get it sorted" it's meaning depends on the situation .
If for example you have a complicated situation/problem and you say "We'll get it sorted" , you will mean " lets solve this problem (either solve it yourselves or by asking someone to help ) ".....but basically your intention is to solve the problem.