Hey! Nice to see this happening!
I am the one who actually reworked the new bitcoin.org and I handle most of the updates on it since a few months. The layout of the menu has been just recently changed to a dropdown menu in order to make the layout less cluttered while allowing some more room for content like an "Events" page. You might want to re-consider your design based on these recent changes. The "Press" and "Enthusiasts" pages were not considered relevant by many at the same level than "Individuals", "Businesses" and "Developers". Press is now a resource and "Enthusiasts" is now "Innovation". I planned to suggest a complete rewrite of this page to focus on concrete technical innovations and their potential uses and good sides.
If you want to continue this re-design project until we get something concrete, well tested and with enough consensus from everyone that it's better, improvements are welcome. There are a few challenges, including compatibility with mobile devices and IE6 (for Chinese users), which I succeeded to provide in the last months with various other work. I also agree that the actual main page is probably too sober. Though however, in general, from the comments I received, people always had the opposite opinion for all other pages : the design became more sober over time to fit those comments. So this might actually be something to work on with your design.
For what it's worth, I personally think that there is a potential nice start here but that further work would be good.
There was also this attempt in the past, but I didn't get an answer from the designer who did it when I contacted him recently.
http://forrst.com/posts/Rebranding_of_Bitcoin-Ft5The current website (with build instructions) is on github :
https://github.com/bitcoin/bitcoin.org and you can indeed add a pull request for review here when you have something you feel is ready for review. I can assist you if you have questions and I can help integrating your work with the current website code.
Edit1 : I forgot to mention that the current design is also translation friendly : All contents scale or provide enough space so that translations with variation in sizes won't cause ugly overflows with buttons, menus and such. From what I see, the three icons "Instant P2P transactions", "Worldwide payments".. could hit problems with that.
Edit2 : bitcoin.org is mainly managed by Bitcoin core developers and me so far. Having the opinion of Bitcoin foundation members is good, but not a requirement.