Yes you can use it commercially. That's the nice thing about the license in CRYENGINE. No additional costs when using Scaleform. Except for Scaleform Video that is.
Yes, and that is painful. I've sent official enquiry myself and got response from them stating that I should have both licenses. Licensing changed and it starts with $7000 + circa $2000 maintenance or something similar. In total it can add up to $20k so it's definitely not the solution. Many people here stated here that you can use GFX but docs say otherwise... so it's not really confirmation, just assumption.
Some say it's different version of GFX and you can use it but it would be good if someone from Crytek staff would confirm it once for all. As with Scaleform - they clearly said I will need licenses so it's a big risk to rely purely on forum answers from forum member, not official Crytek employees .
If that's needed externally that would pretty much kill the CE in many indiee devs eyes.
There are some alternatives (HTML5) - Chrom... something - I've seen docs and it's pretty limited and I guess it's aimed to launch 'browser' like interface.. However it's worth checking other options.