Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
I hope the R600 will come in versions without optical drive, just like the R500 did. Being a fan of ultraportables for several years I happily leave the external optical drive at home 99% of the times I take my ultraportable out. This would save further weight. It doesn't sound good to me that the R600 is specified to have a starting weight of 2.4 pounds (1.08 kg) when the R500 had a starting weight of 1.7 lbs (0.78 kg).
Also, I really hope they improved the screen. This is an absolute must. It was dreadful on the R500: uneven backlight, terrible bleeding and ridicilously narrow viewing angle.