What's really new?
Everything that takes a huge success has to implement something new.
Is multithread really that "huge new thing" that will make million of people to try their browser?
How many times you had problems with a website that kept crashing the entire broswer? I had not experienced it so many times to really be desperatly looking for a new web broswer.
and when a crashing happens the ability to restore the state before the crashing that we already have on firefox is not that annoying to justify this "new function" to make the new broswer a success.
I do expect a lot more new stuffs on the browser to turn my surfing experience more interesting making it faster, simpler and smart...
I bet the new sensation for the softwares is "smart" functions able to guess what we want based on our past actions.