This was featured in the demo that I saw behind closed doors. Readers have been complaining about Lightning not being a focus of the game - worried there's more Serah than Noel than anything. Liz was just sharing some footage, what's the harm? This is a long thread, it's hard to keep track of every single video that has been posted in it.
I think it's too early for anyone to speculate how much of the focus will be on Lightning, a lot of people jumped the gun when they saw E3 footage and immediately deemed her a side character (I'm not accusing anyone here, I'm saying what I've seen around the internet). We don't know that. Personally, from what I saw at E3, I was getting the vibe that they were going to go back and forth between Lightning's struggles to Serah and Noel trying to find her. Maybe people wanted to be in control of Lightning the whole time and that's where the disappointment stems.