Yes, I have noticed a lot of this happening. An off shoot trend you could say is, long high waisted pencil skirts with short tank tops, sleeveless or otherwise, that bare only a hint of midriff a la YSL, Chloe and Versace.
I also agree that the bare midriff looks great at Theyksen's Theory. Personally I don't mind this trend. It's just that I spent about 15 years of my life walking around like this, having my midriff covered only in winter when I was wearing a coat, and finally gave up doing this about a year ago because I thought I was too old now for that look I'm not unhappy about this becoming a trend again, I have a long torso and find it hard to find tops that are long enough to cover my midriff anyway.
I totally get the whole midriff trend but I don't know how I personally feel about it. I mean yeah sure if youre a superskinny model but I don't think that it's for every woman out there. I would so not like to se my mother in this trend for example. But I do rekon that it's going to be a huge blog trend.