In case you've missed the 15 other places announcing it,
here's a cached link to the post - read the
scanned comic, which is by Scott McCloud and explains the ideas behind it.
It's fascinating, and I'm very happy to have them enter the game - they're using WebKit, which is the tech underlying Safari, the Nokia S60 browser, Adobe AIR and Android, but they're building in some very interesting variations in design.
Hopefully this will split the web space even further - meaning that more stuff gets designed to the spec, and not to fit any one browser. I hope that they attract as much of an addon ecology as Firefox has. I won't be switching until they have AdBlock, GreaseMoney, FoxMarks, etc. equivalents, but that may not be that long...