go to Product > Archive
there you have option for validate or distribute build
1) I have selected Target > iPhone and make new build but anyway iTunes page tells about missing screenshot for iPad, lol
"Universal binaries require at least one screenshot for every supported device. Additionally, you must provide the required screenshots for each localization."
2) For 10 attempts to upload package, I get 3 upload OK and 7 SSL errors
3) sometimes Xcode shows warning about missing launch image for 4' Retina screen, but WTF - it's already there (straight from CocoonJS)