The UI is nice, but they keep referring to it as their "product" in the marketing material, so I'm not sure if it will become pay software at 1.0. Perhaps they'll sell the services around it, but they don't say anything, so it's hard to do anything but guess.
I am wondering, how did these guys got that domain name. I think such domains should be used for what they are supposed to - Vivaldi, and not some random beta browser (although it might be pretty good!). Too much hype put in the wrong place these days :(
7. Without limiting the foregoing, you are neither allowed to (a) adapt, alter, translate, embed into any other product or otherwise create derivative works of, or otherwise modify the Software ; (b) separate the component programs of the Software for use on different computers; (c) reverse engineer, decompile, disassemble or otherwise attempt to derive the source code for the Software, except as permitted by applicable law;"