I love the new design too. Not seeing a huge speed difference here, but I do hope it's less server load for Winmatrix because this site has had it's fair share of downtimes in 2012.
The 'Like' button is definitely better than the +1 button
Because, except for the forum logo, the rest is just the default skin of this version of IP.Board ( http://www.invisionpower.com/ ).
Yep. Same goes for the previous version of Winmatrix, it was mostly the default skin with a few tweaks here and there.