I hope they allow people to keep the old current look if they'd like. I'm more tired of changing constantly then anything, and I love the UI in firefox now. Not that new ideas shouldn't be tried, just that what's not broken shouldn't be "fixed". And I personally don't like chrome because it seems to simple, so trying to turn into Chrome isn't going to win my vote. (but hey, it's about what the mass wants right?)
Firefox will always be the most customizable of any of the major browsers. If you don't like the default theme there are thousands of others to choose from, as there are today.
