What benefits does dictionary initializers add over collection initializers?

Question

In a recent past there has been a lot of talk about whats new in C# 6.0
One of the most talked about feature is using Dictionary initializers in C# 6.0

Answer 1

New is creating a dictionary this way

Dictionary myDict = new Dictionary() {
    [1] = "Pankaj",
    [2] = "Pankaj",
    [3] = "Pankaj"
};

with the style of =

Obsolete: string indexed member syntax (as stated in the comments)

Dictionary myDict = new Dictionary() {
        $1 = "Pankaj",
        $2 = "Pankaj",
        $3 = "Pankaj"
    };

Taken from A C# 6.0 Language Preview

To understand the $ operator, take a look at the AreEqual function call. Notice the Dictionary member invocation of “$Boolean” on the builtInDataTypes variable—even though there’s no “Boolean” member on Dictionary. Such an explicit member isn’t required because the $ operator invokes the indexed member on the dictionary, the equivalent of calling buildInDataTypes["Boolean"].