We've seen Batman, Superman, Wonder Woman (and Abraham Lincoln, a Mutant Turtle, etc) but I think this is our first look at The Flash.
Appropriately enough, he's pretty much 'blink and you miss him,' though.
I agree, it looks awesome.
It's also nice to know that there will be screenings across the UK on the second weekend of February – so not this weekend coming or the one after, but the one after that. General release is still set for the 14th, though, and in the US, it's still the 7th.