Both of which will be replaced by Light Peak next year...
I wish that was true. Production of LP will start late this year but in the beginning, it'll be meant for professionals, possibly via PCIe. Sandy Bridge chipsets will not support it. Ivy Bridge is too far away so there isn't any news about it but I can see it being integrated into high-end chipset by then. In 2013, we may see it in mainstream chipsets.
Another issue is that it's made by Intel, not by multiple companies like USB is. Intel is known of its dictator so they can make the mistake and make it too expensive so other companies won't adopt it, meaning that USB will continue its domination. That's the mistake Apple made with FireWire, too high costs to adopt it.
It will take years before it can fight against USB in popularity. Why? Because not everyone buys a new computer every year. All computers will have USB anyway, only few will have LP so industry will likely stick with USB until all computers have LP and it's cheap enough. Also, there isn't that many people who even need LP as USB 3.0 which is more reality today than LP is can already deliver nearly 5Gbit/s, more than SATA 3Gbit/s can which is the standard nowadays. Hard drives won't go over 200MB/s unless you RAID them and RAID is more or less for pros and geeks, not for average Joe. SSDs can already saturate the SATA II, actually fastest PCIe SSDs are faster than 10Gbit/s LightPeak. However, SSDs won't be mainstream, yet. Possibly in couple of years but by then, LP is already available.
I would say, LP isn't going to beat USB before 2015. That's very much up to Intel as well. If they are too greedy, they are ruining their chances. LP has unlimited amount of potential. It can replace all other interfaces, so hopefully, Intel will be wise and price it reasonably, also licensing wise.
Just my guesses, nothing official.