Maybe they assume that the newer keyboards and mouse connections are usb and not ps2. 
I just got a new pc at work, 6 usb rear ports, 2 front usb ports, no ps2 ports.  
You can always use a ps2/usb adapter to connect to a usb port.
Paul Hachmeyer

-----Original Message-----
From: Personal Computer Hardware discussion List [mailto:[log in to unmask]] On Behalf Of Tom Waddell
Sent: Tuesday, December 14, 2010 3:23 PM
To: [log in to unmask]
Subject: [PCBUILD] Dual Mouse/Keyboard PS2 connector. How do they work?

Just started to see these on MB's. How do you connect a mouse AND a keyboard at the same time, buy a "Y" connector?

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