Array declaration and initialization in C++11

Here are 8 ways to declare and initialize arrays in C++11 that seems ok under g++:

/*0*/ std::array<int, 3> arr0({1, 2, 3});
/*1*/ std::array<int, 3> arr1({{1, 2, 3}});
/*2*/ std::array<int, 3> arr2{1, 2, 3};
/*3*/ std::array<int, 3> arr3{{1, 2, 3}};
/*4*/ std::array<int, 3> arr4 = {1, 2, 3};
/*5*/ std::array<int, 3> arr5 = {{1, 2, 3}};
/*6*/ std::array<int, 3> arr6 = std::array<int, 3>({1, 2, 3});
/*7*/ std::array<int, 3> arr7 = std::array<int, 3>({{1, 2, 3}});

What are the correct ones according to the strict standard (and the upcoming C++14 standard) ? What are the most common/used and those to avoid (and for what reason) ?