Alyssa Rosenberg celebrates a welcome change:

No matter the gender, Kate's baby will be heir to the British throne. Six months after William and Kate's wedding, the British Commonwealth countries finally scrapped the rules that gave boys precedence over girls in the royal line of succession. So if this royal baby is a girl, Will and Kate won't have to get to work on a boy immediately—or ever.

Alyssa later adds:

If Kate has a girl, she gets to be Queen, period, without any worry that she’ll be leapfrogged by a younger brother. That’s awesome, and shockingly overdue.