As I said before, the "New Posts" feature was never shown in the additional skins - you may have just noticed it since I forced the vBulletin skin while upgrading the other ones.
Though also as I said before, I'll create a link in the Quick Links for "New Posts" to add convenience.
Yes, I can make the Chat button open a new window. I'm not sure if it use to be like that or not, but it's a good idea, nonetheless.
About the "Yellow and Black" style: I will install it once I've finished the template hacks. If you'll notice, I still need to fix the Logout feature in the Quick Links and I need to add what I previously stated in this post. With that said, do not expect the new style to be installed tonight - sorry about this inconvenience.