Hook up your phone to iTunes, and then where it says "Serial Number", click it and it will switch to your UDID. Then hit Ctrl + C and it'll copy it. (not sure about the last part, but it worked on the Mac to hit Command + C so I assume it'll work on the PC) Also, no need to highlight the number.
ctrl+c should work, an alternative would be to go to edit up in the taskbar with file and all that, and choose copy. again no need to highlight.
I guess they will announce the beta testers so that those who do not make it would know that they did not make it
kno that what? you didnt get picked? why not just check this thread, thers going to be people saying they got picked probably.